Trump's rise in the Quinnipiac poll is boosted by first-time Iowa voters: 40 percent say they will support him, compared with 22 percent for Cruz.

Among first-time voters, Sanders holds a major lead over Clinton, 62 to 35 percent, while Clinton holds a 9-point lead among those who have caucused before.



Martin O’Malley has 3 percent support in the Hawkeye State.



Attention in the 2016 cycle has been largely dominated by political outsiders, and pollsters predict high turnout could boost Trump and Sanders, who have positioned themselves as such.

The survey of 890 likely GOP caucusgoers and 919 likely Democratic caucusgoers was conducted Jan. 25–31 via landlines and cellphones with a margin of error of 3.3 points for Republicans and 3.2 points for Democrats.