Bernie won the vote among...

Voters under age 45

Voters that have gone through some college but aren't college graduates (that would likely be college students)

Voters who have a family income under $50,000

First time caucus goers

voters who say they are liberal / very liberal

voters who are not married

voters that believe that income inequality is the most important issue facing the nation

voters that considered "cares about people like me" and "honest and trustworthy" as qualities that mattered most in deciding who to support.

voters who decided who to support within the last month

voters in cities over 50,000

http://www.nbcnews.com/politics/2016-election/primaries/IA