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Carson: Trump's 'an OK doctor'
Ben Carson and Donald Trump weigh in on vaccinations at the Republican debate.
03:09 - Source: CNN
2016 Presidential Debates 59 videos
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Carson: Trump's 'an OK doctor'
03:09
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Tapper: 'Unbelievable' how quickly Trump took the bait
00:52
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CHARLESTON, SC - JANUARY 17: Democratic presidential candidates Martin OMalley (L), Hillary Clinton (C) and Senator Bernie Sanders (I-VT) participate in the Democratic Candidates Debate hosted by NBC News and YouTube on January 17, 2016 in Charleston, South Carolina. This is the final debate for the Democratic candidates before the Iowa caucuses. (Photo by Andrew Burton/Getty Images)
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NBC Democratic presidential debate in 90 seconds
01:30
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Clinton, Sanders disagree on support of President Obama
01:16
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CHARLESTON, SC - JANUARY 17: Democratic presidential candidates Martin OMalley (L), Hillary Clinton (C) and Senator Bernie Sanders (I-VT) participate in the Democratic Candidates Debate hosted by NBC News and YouTube on January 17, 2016 in Charleston, South Carolina. This is the final debate for the Democratic candidates before the Iowa caucuses. (Photo by Andrew Burton/Getty Images)
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Debate reality check: Who was telling the truth?
02:02
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Bernie Sanders defends gun control record
01:32
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Clinton to Sanders: I'm not starting over on healthcare
02:12
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Sanders: 'The Democratic Party needs major reform'
01:02
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Trump: Cruz 'insulted 20 million people'
01:00
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Republican presidential candidates, from left, Ohio Gov. John Kasich, New Jersey Gov. Chris Christie, Sen. Marco Rubio, R-Fla., businessman Donald Trump, Sen. Ted Cruz, R-Texas, retired neurosurgeon Ben Carson and former Florida Gov. Jeb Bush take the stage before the Fox Business Network Republican presidential debate at the North Charleston Coliseum, Thursday, Jan. 14, 2016, in North Charleston, S.C. (AP Photo/Rainier Ehrhardt)
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Fox Business GOP debate in 90 seconds
01:30
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WASHINGTON, DC - JANUARY 12: President Barack Obama delivers his State of the Union address before a joint session of Congress on Capitol Hill January 12, 2016 in Washington, D.C. In his final State of the Union, President Obama reflected on the past seven years in office and spoke on topics including climate change, gun control, immigration and income inequality. (Photo by Evan Vucci/Pool/Getty Images)
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GOP Candidates Take Swings at Obama's SOTU
01:26
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Rubio, Cruz clash over proposed VAT tax
01:51
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NORTH CHARLESTON, SC - JANUARY 14: Republican presidential candidates (L-R) Donald Trump and Sen. Ted Cruz (R-TX) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. The sixth Republican debate is held in two parts, one main debate for the top seven candidates, and another for three other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
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Trump to Cruz: You're a liability as a candidate
02:07
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Rubio to Cruz: We all saw you flip your vote
02:00
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Ted Cruz deflects NYT 'hit piece'
01:20
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Christie: State of the Union was story time with Obama
01:29
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Bush: Trump's ban makes it impossible to take out ISIS
01:23
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