Entrance polls on the Democratic side show Barack Obama won decisively among first-time caucus goers, who made up 57 percent of those attending caucuses. Forty-one percent of those first-timers went for Obama, while 29 percent picked Hillary Clinton. John Edwards was the top pick among those who had caucused before, winning 30 percent of their vote.

See more Dem entrance poll data from CNN

On the GOP side, Mike Huckabee did well among voters who defined themselves as born-again or evangelical Christian, picking up 46 percent of their vote compared to Mitt Romney's 19 percent. Overall 60 percent of those surveyed by CNN identified themselves as born-again or evangelical.

See more GOP poll data from CNN