Republican presidential front-runner Donald TrumpDonald John TrumpTrump: 'I don't trust everybody in the White House' JPMorgan CEO withdraws from Saudi conference Trump defends family separations at border MORE holds a 7-point lead over rival Ted CruzRafael (Ted) Edward CruzNoisy democracy, or rude people behaving like children? Democrats hold fading odds of winning Senate this November Donald Trump Jr. emerges as GOP fundraising force MORE in Iowa, fueled by first-time GOP caucusgoers, according to a new poll.

Trump leads Cruz, 31 to 24 percent, in the Quinnipiac poll released Monday morning.
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Marco RubioMarco Antonio RubioSenators pledge action on Saudi journalist’s disappearance Senators concerned as Trump official disputes UN climate change warning Rubio: Response to death of Saudi journalist 'can't be symbolic' MORE has 17 percent, while no other GOP candidate has double-digit support, with Ben Carson the closest, at 8 percent. 

Trump has edged past Cruz in the Hawkeye State over the past few weeks but on Monday shied away from predicting a win over his GOP rivals.
 
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.