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Bernie Sanders and Hillary Clinton shake hands at the end of the Democratic presidential debate hosted by ABC News at Saint Anselm College in Manchester, New Hampshire, on December 19, 2015.
Bernie Sanders and Hillary Clinton shake hands at the end of the Democratic presidential debate hosted by ABC News at Saint Anselm College in Manchester, New Hampshire, on December 19, 2015.

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    Clinton, Sanders spar ahead of Iowa caucuses

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Clinton, Sanders spar ahead of Iowa caucuses

CNN's Brianna Keilar reports.

Clinton, Sanders spar ahead of Iowa caucuses

CNN's Brianna Keilar reports.