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.

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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