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- Robert Kagan


- Author Robert Kagan talks about advising Mitt Romney on foreign policy and explores America's use of military force in international affairs.
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- Michio Kaku


- Michio Kaku believes we will have something resembling a Harry Potter invisibility cloak within the coming decades.
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- Maira Kalman


- Maira Kalman thinks Abraham Lincoln would have been the most incredible boyfriend.
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- Colbert Report: Dean Kamen Pt. 1


- Stephen takes Dean Kamen's IBot for a spin.
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- Colbert Report: Dean Kamen Pt. 2


- Stephen tells Dean Kamen his fears about robot technology.
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- Dean Kamen


- Dean Kamen demonstrates how his prosthetic arm invention helps soldiers feed themselves.
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- Colbert Report: David Kamp Pt. 1


- David Kamp tells Stephen about the fancy-pantsification of American food.
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- Colbert Report: David Kamp Pt. 2


- Stephen asks David Kamp if baby carrots are trying to make him gay.
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- Colbert Report - John Kao


- John Kao warns Stephen that if the US remains complacent, we will suffer a brain-drain to Finland.
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- Colbert Report - Garry Kasparov


- Stephen challenges Russian presidential candidate, Garry Kasparov, to a game of Rock'em Sock'em Robots.
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- Colbert Report: Neal Katyal Pt. 1


- Stephen talks to Neal Katyal, who defended Guantanamo Bay detainees before the Supreme Court.
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- Colbert Report: Neal Katyal Pt. 2


- Attorney Neil Katyal brought props for his interview with Stephen.
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- Colbert Report: Neal Katyal


- Stephen asks Neal Katyal if his goal of bringing rights to the prisoners at Guantanamo is his private jihad.
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- Jeffrey Katzenberg


- Jeffrey Katzenberg listens to Stephen's movie script idea and presents the newest 3-D glasses.
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- Colbert Report: Charlie Kaufman


- Charlie Kaufman must describe his new movie "Synecdoche, New York" using the words "feel good" and "sassy Chihuahua."
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- Katty Kay


- Katty Kay explains how valuable women are in the workplace, even though they work in different ways than men.
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- Leslie Kean


- Leslie Kean describes the hard evidence of UFOs and calls for more investigation into them.
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- Diane Keaton


- Oscar-winning actress Diane Keaton skirts Stephen's questions and misinterprets a backstage hug.
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- Colbert Report - Garrison Keillor


- Stephen offers Prairie Home Companion's Garrison Keillor some of his Formula 401.
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- Colbert Report - Toby Keith


- Now that Toby Keith has gotten the Colbert bump, he agrees to return the favor.
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- Colbert Report: Toby Keith


- With "Beer for My Horses," Stephen worries that Toby Keith will start hanging out with Sean Penn and chaining himself to whales.
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- Toby Keith


- Country music star Toby Keith takes on globalization and helps Stephen get the "ho"s out of America.
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- Garret Keizer


- Garret Keizer says noise and silence get distributed like other forms of wealth and disadvantage.
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- Sean Dorrance Kelly


- Sean Dorrance Kelly believes that we've lost the notion of what's sacred in our existence.
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- Caroline Kennedy


- Caroline Kennedy and Stephen read poetry by W.H. Auden and Edna St. Vincent Millay.
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- Colbert Report: Robert Kennedy, Jr.


- Stephen and Robert Kennedy, Jr. discuss whether Bush stole the 2004 election.
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- Robert F. Kennedy, Jr.


- Robert F. Kennedy, Jr. says mountaintop mining is not a good thing for American democracy.
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- Colbert Report: Sen. John Kerry


- Senator John Kerry tells Stephen he was against the environment before he was for it.
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- David Kessler


- David Kessler wants to save lives by getting Americans to eat less.
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- Alicia Keys


- Stephen wants Alicia Keys to address the suburban crowd in her hit song, "Empire State of Mind."
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- Salman Khan


- Salman Khan hopes that anyone with an Internet connection will use his YouTube lessons to learn.
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- Kid Gloves - Marc Kielburger


- Marc Kielburger attempts to break the cycle of poverty by taking kids out of child labor and putting them in school.
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- David Kilcullen


- David Kilcullen fights wars by taking a local approach to combat smaller guerrilla movements.
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- Colbert Report: Carole King


- Unless Stephen decides to run for president again, Carole King is supporting Hillary.
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- Colbert Report: Larry King


- Stephen wants to know if Larry King's suspenders are lethal weapons.
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- Colbert Report: John King


- Stephen congratulates John King and the rest of the media on getting Obama elected.
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- Walter Kirn


- Walter Kirn says if they put Ivy League schools like Princeton on the web, people at state schools would feel less inferior.
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- Henry Kissinger Pt. 1


- Henry Kissinger will negotiate with Mao Zedong but has cut off relationships with an eight-year-old.
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- Henry Kissinger Pt. 2


- Henry Kissinger and Stephen have a difference of opinion regarding the Cold War.
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- Alison Klayman


- Alison Klayman explains the Chinese government's possible reasons for beating and imprisoning artist Ai Weiwei.
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- Action Center - Health Care Bill - Ezra Klein


- Ezra Klein explains the reconciliation process that Democrats need to pass health care reform and what Republicans can do to drag it out.
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- Colbert Report - Joel Klein


- New York City Schools Chancellor, Joel Klein is motivating students by paying them to study.
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- Colbert Report: Naomi Klein


- Naomi Klein wants us to be prepared for leaders to take advantage of us in moments of crises.
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- Kevin Kline


- Kevin Kline is known for his great stage prominence, but Stephen will not be out-enunciated by him.
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- Jeffrey Kluger


- Author Jeffrey Kluger discusses the effect of sibling dynamics on people's lives and explains why Stephen is such a charmer.
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- Douglas Kmiec


- Douglas Kmiec doesn't want the state to adopt any religion's perspective and impose it on Americans.
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- Kris Kobach


- Kris Kobach wants to fight illegal immigration on the local level and reward the people willing to come to this country legally.
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- Colbert Report: Brendan Koerner


- Stephen wants Brendan Koerner to tell him why they make fluorescent light bulbs look like soft serve ice cream if you're not supposed to lick them.
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- Colbert Report: Gina Kolata


- Gina Kolata says that you can be happy, healthy and look good without being skinny.
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- Colbert Report: Wendy Kopp Pt. 1


- Stephen asks Wendy Kopp why we need Teach for America if we have No Child Left Behind.
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- Colbert Report: Wendy Kopp Pt. 2


- Stephen tells Wendy Kopp that by eliminating schools entirely, everyone gets an equal education.
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- Jon Krakauer


- Jon Krakauer explains how the Bush administration turned Pat Tillman's death into a propaganda tool.
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- Amy Kremer


- Stephen asks Amy Kremer if she'd raise taxes to save eight million lives from a ticking nuclear bomb.
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- Colbert Report: Nick Kristof


- Stephen asks Nicholas Kristof why we should pay attention to the rest of the world.
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- Nicholas Kristof


- Nicholas Kristof describes the endocrine disruptors in the water that are causing genital malformations in male animals and humans.
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- Colbert Report: Kris Kristofferson Pt. 1


- Stephen wants to know how Kris Kristofferson can be a country musician and a liberal at the same time.
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- Colbert Report: Kris Kristofferson - Help Me Make It Through The Night


- Kris Kristofferson performs "Help Me Make It Through the Night."
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- Colbert Report: Paul Krugman Pt. 1


- Paul Krugman explains to Stephen how politics and ecomonics are related.
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- Colbert Report: Paul Krugman Pt. 2


- Paul Krugman is part of that fringe 60% of the population that thinks the war was a mistake.
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- Paul Krugman


- Paul Krugman says the stimulus package is enough to help, but not enough to cure the economic crisis.
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- Mike Krzyzewski


- Mike Krzyzewski differentiates between teamwork and socialism.
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- Colbert Report: Alex Kuczynski Pt. 1


- Alex Kuczynski explains why we don't look better after spending 15 billion dollars on plastic surgery.
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- Colbert Report: Alex Kuczynski Pt. 2


- Alex Kucynski had collagen injections from corpses. Stephen wonders if they were evil corpses?
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- Colbert Report: James Howard Kunstler


- James Howard Kunstler warns suburbia that it will run out of energy very soon.
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- Colbert Report: David Kuo Pt. 1


- David Kuo wrote Tempting Faith to point out that Jesus and Bush are different people.
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- Colbert Report: David Kuo Pt. 2


- Stephen and David Kuo talk about "compassionate conservatives" and separation of church and state.
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- Colbert Report: Interview - Howard Kurtz


- Stephen asks Howard Kurtz if late night comedy shows should have any influence in politics.
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- Ray Kurzweil


- Ray Kurzweil predicts that people will merge with technology and become a billion times smarter by 2045.
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- Talib Kweli


- Talib Kweli thinks his conscious rapper label is a limitation and a compliment.
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- Talib Kweli & Yasiin Bey (A.K.A. Mos Def)


- Black Star's Talib Kweli and Yasiin Bey (A.K.A. Mos Def) discuss their musical partnership and working outside the major record label structure.
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