Donald Trump thought he could upend Iowa caucus traditions. The gamble didn't pay off.
Hillary Clinton hoped she could wipe away her campaign nightmares of eight years ago by posting a solid win over an insurgent Bernie Sanders.
Instead, her margin of victory over Sanders was vanishingly small.
Those were just some of the surprise twists from Monday night's results. Here's what the numbers and results tell us about how and why they happened, according to our analysis of the entrance/exit polling and the county-by-county results.