Iowa Caucuses Underway As Moment Of Truth Arrives For Candidates - Live Coverage

Update: The first votes are starting to trickle in and with Ted Cruz and Trump jockeying for the top spot. Clinton is still leading Sanders, although the race is close, as expected.
Update: As shown below, turnout is topping all expectations on both the Democratic and Republican sides. That should bode well for Trump and perhaps for Sanders, although the number of first time caucus goers is apparently lower than the Sanders campaign would have liked.