Sen. Bernie Sanders, of Vermont,, left, and Hillary Rodham Clinton laugh during the CNN Democratic presidential debate, Tuesday, Oct. 13, 2015, in Las Vegas. (AP Photo/John Locher)
Sen. Bernie Sanders, of Vermont,, left, and Hillary Rodham Clinton laugh during the CNN Democratic presidential debate, Tuesday, Oct. 13, 2015, in Las Vegas. (AP Photo/John Locher)
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