Poll: Fiorina leads Clinton by double digits in Iowa
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A new poll finds GOP presidential candidate Carly Fiorina leading Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonElection fears recede for House Republicans To woo black voters in Georgia, Dems need to change their course of action Trump lawyer touts petition to stop 'soft coup' against Trump MORE by 14 points in the early-voting state of Iowa.

The Wall Street Journal/NBC News/Marist poll found Fiorina up 52-38, with Clinton trailing several GOP rivals in Iowa and New Hampshire in hypothetical head-to-head match-ups.

The largest Iowa gap is with Fiorina, but former Secretary of State Clinton also trails Jeb Bush by 10 points and Donald TrumpDonald John TrumpTrump and Kim fight PR war as summit talks collapse Trump appears to confirm deal on Chinese firm ZTE Judge rejects Manafort's attempt to throw out some charges MORE by 7 points there in the poll.

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Sen. Bernie SandersBernard (Bernie) SandersTrump: ‘Clapper has now admitted there was spying on my campaign’ Overnight Defense: Trump decision on Korea summit coming 'next week' | China disinvited from major naval exercise | Senate sends VA reform bill to Trump Senate sends major VA reform bill to Trump's desk MORE (I-Vt.), Clinton's top rival for the Democratic race, fairs better. Sanders trails Bush and Fiorina by just 2 and 3 points respectively, and leads Trump by 5 points.

In New Hampshire, where Clinton announced her gun-control proposals Monday, Sanders leads Fiorina by 2 points, bests Trump by 10 points and ties with Bush, while Clinton trails Fiorina by 8 points, Bush by 7 points and leads Trump by 3 points.

A similar NBC News/Wall Street Journal poll released last week found Vice President Joe BidenJoseph (Joe) Robinette BidenTop Oversight and Foreign Affairs Dems ask Black Cube for answers on alleged Iran deal op Biden, Corker honored with Freedom House human rights awards What's wrong with the Democratic Party? Just look at California MORE, who is considering entering the Democratic race, fairing better nationally than Clinton in match-ups with several Republican presidential candidates.

Trump and Clinton continue to lead their respective parties in the two early-voting states after the second GOP debate last month and ahead of the first Democratic debate next week.

Trump's lead in Iowa, though, has narrowed. He has 24 percent support, followed by Ben Carson at 19 percent, Fiorina at 8 percent and Bush at 7 percent among 491 GOP voters, with a 4.7 percent margin of error.

Trump leads Fiorina by 5 points in New Hampshire, 21 to 16 percent, followed by Bush at 11 percent and Sen. Marco RubioMarco Antonio RubioTrump appears to confirm deal on Chinese firm ZTE Hillicon Valley: Experts worry North Korea will retaliate with hacks over summit | FBI works to disrupt Russian botnet | Trump officials look to quell anger over ZTE | Obama makes case for tighter regs on tech Putting pressure on Trump, House passes bill barring government from doing business with ZTE MORE (R-Fla.) and Carson tied at 10 points each. 

On the Democratic side, a survey of 348 Democratic voters, with a 5.3-point margin of error, finds Clinton leading in Iowa (47 percent), followed by Sanders (36 percent) and former Maryland Gov. Martin O'Malley (4 percent). Sanders has a 9-point lead in New Hampshire.

The surveys of 1,061 registered voters in Iowa and 1,044 in New Hampshire were conducted Sept. 23 to Sept. 30 with a margin of error of 3 points each.