Ben Carson is starting to tumble ...

Politico's Story on Ben Carson and West Point Under Scrutiny

Retired neurosurgeon Ben Carson looks like he may be losing some steam in a slew of recent national and state polls that have shown clear warning signs for his candidacy.

A Fox News poll of Republican voters released on Sunday found Carson tumbling 6 points, dropping back down to 18% support.

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In the poll, he trailed front-runner Donald Trump, who has held steady, by 10 points. Fox's poll also put Sens. Ted Cruz (R-Texas) and Marco Rubio (R-Florida) in a tie for third with 14% each.

Carson also has slumped in Iowa, the crucial first-nominating state where Carson has gained traction with the state's more conservative and evangelical groups.

According to a CBS poll released Sunday, Carson's support in the Hawkeye State has dipped to 19%. That put him below Trump, whose support sits at 28% in the poll, and Cruz, who garnered 21%. For Carson, it's a quick turn of events from last month, when he regularly surged ahead of Trump in Iowa polls.

And in the first-in-the-nation primary state of New Hampshire, Carson slipped to third in polls conducted by CBS and Suffolk University.

Carson's best standing Sunday came in a Washington Post/ABC poll. That survey showed Trump maintaining his healthy lead over the field, with 32% of likely Republican voters preferring the real-estate tycoon. Carson also held steady at 22% support, exactly the same as where he stood one month ago in the survey.

See photos of Ben Carson on the campaign trail:

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Ben Carson is starting to tumble ...
MT. AYR, IA - JANUARY 22 : Republican presidential candidate Ben Carson is introduced during his 'Trust in God Townhall' campaign stop January 22, 2016 in Mt. Ayr, Iowa. Carson, who is seeking the nomination from the Republican Party is on the presidential campaign trail across Iowa ahead of the Iowa Caucus taking place February 1. (Photo by Joshua Lott/Getty Images)
Ben Carson, 2016 Republican presidential candidate, speaks during a Liberty University Convocation in Lynchburg, Virginia, U.S., on Wednesday, Nov. 11, 2015. As retired neurosurgeon Carson has risen in the polls, media reports have revisited his accounts of acts of violence as a child, a key part of the redemption story he discusses on the campaign trail. Photographer: Andrew Harrer/Bloomberg via Getty Images
PALM BEACH GARDENS, FL - NOVEMBER 06: Republican presidential candidate Ben Carson speaks to the media before speaking at a gala for the Black Republican Caucus of South Florida at PGA National Resort on November 6, 2015 in Palm Beach, Florida. Carson has come under media scrutiny for possibly exaggerating his background and other statements he has made recently. (Photo by Joe Raedle/Getty Images)
DES MOINES, IA - AUGUST 16: Republican presidential hopeful Ben Carson (L) eats a piece of pizza while touring the Iowa State Fair on August 16, 2015 in Des Moines, Iowa. Presidential candidates are addressing attendees at the Iowa State Fair on the Des Moines Register Presidential Soapbox stage and touring the fairgrounds. The State Fair runs through August 23. (Photo by Justin Sullivan/Getty Images)
LAKEWOOD, CO - OCTOBER 29: Republican presidential candidate Ben Carson speaks during a news conference before a campaign event at Colorado Christian University on October 29, 2015 in Lakewood, Colorado. Ben Carson was back on the campaign trail a day after the third republican debate held at the University of Colorado Boulder. (Photo by Justin Sullivan/Getty Images)
WASHINGTON, DC - SEPTEMBER 25: Scenes around the the Value Voters Summit on September 25, 2015 in Washington DC. Republican presidential candidate Ben Carson takes the stage at the event. Dr Carson speaks to the media after the speach. (Photos by Charles Ommanney/The Washington Post via Getty Images)
Attendees wait for Ben Carson, 2016 Republican presidential candidate, not pictured, to arrive during a campaign stop at the birthplace of the Michigan Republican Party in Jackson, Michigan, U.S., on Wednesday, Sept. 23, 2015. Carson, the third candidate in the Republican race to have never held elected office, saw his numbers drop following the debate last week. Photographer: Luke Sharrett/Bloomberg via Getty Images
Ben Carson, 2016 Republican presidential candidate, listens as he attends a service at Maple Street Missionary Baptist Church in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. Carson will be speaking at the Iowa State Fair, which is expected to host 18 presidential candidates and runs until Aug. 23. Photographer: Daniel Acker/Bloomberg via Getty Images
CLEVELAND, OH - AUGUST 06: Republican presidential candidate Ben Carson participates in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls. (Photo by Chip Somodevilla/Getty Images)
Ben Carson, 2016 Republican presidential candidate, eats a slice of pizza as he tours the Iowa State Fair in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015. In a Sunday interview with Fox News, Carson doubled down on his assertion that a speech given by President Barack Obama intended to sell the American public on his nuclear deal with Iran contained 'coded innuendos employing standard anti-Semitic themes.' Photographer: Daniel Acker/Bloomberg via Getty Images
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Some polling analysts -- many of whom caution that early polls are volatile and not predictive of eventual election outcomes -- have been skeptical of Carson's rise.

Princeton University professor and polling expert Sam Wang told Business Insider late last month that the fact that many of Carson's supporters were not fully committed to voting for him suggested that Trump's support may be more solid than Carson's.

"That softness of support for Carson might put him in a similar category as Michele Bachmann, Newt Gingrich, and Rick Santorum, all of whom rose to similar levels of support for several months, but then lost that support by the time voting started," Wang said. "Carson's rise has not yet lasted longer than they did."

"The hardening of support for Trump is extremely interesting and suggests that he might have staying power. His numbers have also lasted longer than those transient candidates from 2012. That puts him in a category more like Pat Buchanan in 1992 and 1996, who didn't get the nomination, but was a major force within the Republican Party."

More from Business Insider:
A key metric shows that Donald Trump still has one big advantage over Ben Carson
Ben Carson is fading fast in the latest Fox News New Hampshire poll
Top Ben Carson ally: I 'regret' helping the NYT connect with the adviser who trashed him

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