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Yes, Bernie Sanders Dominated The 30 And Younger Crowd In Iowa

AP Photo / Al Drago

But, it was not just the so-called millennials feeling "the Bern," caucus voters between the ages of 30 and 44 also boosted Sanders en masse. According to the NBC exit poll, 58 percent of them supported Sanders. Clinton was more than 20 points behind with 37 percent of that demographic.

Throughout the campaign, much has been made of Clinton's struggles to mobilize younger voters. It is a problem the Clinton campaign will need to overcome if it expects to perform well in a general election.

Clinton, however, holds the advantage over Sanders when it comes to older voters. Among seniors (voters 65 and older), Clinton attracted 69 percent of the vote compared to Sanders' 26 percent.