Facebook is shedding light on the big issues and candidates who are generating the most discussion in Iowa even hours before the polls close.
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Measuring the level of buzz from midnight until 12 p.m. CST, the social network's data scientists found the candidate getting the most overall buzz was Bernie Sanders, who was mentioned 42.2 percent of the time among all of the candidates.
The issue most weighing on Iowan's minds is the economy, which was mentioned 16 percent of the time when issues were discussed, according to the data provided by Facebook.
Here's a look at how the rest of the candidates and issues performed.
Bernie Sanders, 42.2 percent; Donald Trump 21.7 percent; Hillary Clinton, 13.1 percent; Ted Cruz, 10.7 percent; Rand Paul, 4.7 percent; Dr. Ben Carson, 2.6 percent; Marco Rubio, 1.9 percent. Martin O'Malley, Mike Huckabee, Christ Christie, Rick Santorum, Carly Fiorina, Jeb Bush, John Kasich and Jim Gilmore all got less than 1 percent each.
Bernie Sanders was the clear winner with 73 percent. Hillary Clinton garnered 25 percent of the discussion, while Maryland Gov. Martin O'Malley got 1 percent.
Donald Trump was the most discussed Republican, with his name coming up 50 percent of the time when Iowans discussed the GOP candidates. Ted Cruz earned 23 percent while Rand Paul racked up 11 percent; Dr. Ben Carson had 6 percent; Marco Rubio had 4 percent; Mike Huckabee earned 2 percent; Chris Christie, Rick Santorum and Carly Fiorina were all at 1 percent while Jeb Bush, John Kasich and Jim Gilmore all registered less than 1 percent.
Economy - 16 percent
Same-Sex Marriage - 10 percent
State Department Emails - 9 percent
Religion - 8 percent
The Affordable Care Act - 7 percent
All Others - 51 percent