Club for Growth super-PAC poll shows Trump drop in Iowa
© Greg Nash

The fiscally conservative group Club for Growth's super-PAC, which has been openly warring with Donald TrumpDonald John TrumpGOP congressman slams Trump over report that U.S. bombed former anti-ISIS coalition headquarters US to restore 'targeted assistance' to Central American countries after migration deal Trump says lawmakers should censure Schiff MORE, released a new poll on Tuesday showing the GOP front-runner falling to second place in Iowa.

The poll found Ben Carson in first place with 21 percent support, followed by Trump at 16 percent, Sen. Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE (R-Fla.) at 11 percent and Jeb Bush and Carly Fiorina with 10 percent each.

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It’s the first poll since late July to find that Trump isn’t in the lead in the first-in-the-nation caucus state.

The Club for Growth credited Trump’s decline to a $1 million ad buy the group placed in Iowa, highlighting Trump’s past as a Democrat and support for liberal policies.

“Donald Trump is not a conservative, and that message is getting through in Iowa,” Club for Growth President David McIntosh said in a statement. “Club for Growth Action can’t take full credit. Trump’s stumbling and substance-free debate performance surely hurt him; but CFG Action’s ads have exposed the truth about his history of support for higher taxes, and his advocacy for single-payer health care, eminent domain, and bailouts. That truth has erased Trump’s lead.”

McIntosh said the group would expand its advertising offensive against Trump in Iowa and other states later this month.

Trump’s lawyers have sent a cease-and-desist letter to the “pitiful little group” accusing them of a “shakedown.” Trump has also threatened a multi-million dollar libel lawsuit. 

The Club for Growth survey of 500 likely Republican caucus-goers was conducted by GOP polling firm Basswood Research between Oct. 3 and Oct. 4 and has a 4.4 percentage point margin of error.