Ben Carson Benjamin (Ben) Solomon CarsonState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex Biden cannot keep letting Trump set the agenda The Hill's 12:30 Report: Trump heads to New Hampshire after renomination speech MORE and Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE are tied among GOP voters in Pennsylvania, a new poll finds.

Carson and Trump each receive 18 percent support from registered Republicans in the Keystone State, according to the Mercyhurst University Center for Applied Politics poll on Monday.

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Former Florida Gov. Jeb Bush trails them with 9 percent.

Former Hewlett-Packard CEO Carly Fiorina next grabs 8 percent support among registered Pennsylvania Republicans.

New Jersey Gov. Chris Christie and Sens. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) and Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) are in a struggle for fifth place with 4 percent apiece.

Former Sen. Rick Santorum (R-Pa.), for his part, ties with three other White House hopefuls at 3 percent in his own state — Former Arkansas Gov. Mike Huckabee, Ohio Gov. John Kasich and Sen. Rand Paul (R-Ky.).

An additional 2 percent back other Republican contenders next year, while 17 percent remain undecided and 1 percent refused an answer.

Mercyhurst’s poll also found that Carson is the best-liked GOP presidential candidate among Pennsylvania Republicans.

It found that 70 percent view the retired neurosurgeon favorably, while 13 percent see him unfavorably.

Trump, in contrast, scores a 57 percent favorability rating and a 40 percent unfavorability rating in Pennsylvania.

Rubio, meanwhile, trails Carson’s likeability with 62 percent favorability and 17 percent unfavorability.

Santorum, a former Pennsylvania lawmaker, gets a 54 percent favorability rating and a 39 percent unfavorability rating.

Monday’s survey also found that 57 percent of Pennsylvania Republicans crave a president from outside the political establishment next year.

Carson, Fiorina and Trump are touting their experience outside of the political world on the campaign trail.

Mercyhurst conducted its latest poll of 483 registered Pennsylvania Republicans from Sept. 21-Oct. 1. It has a 4.5 percent margin of error.

Trump is the GOP front-runner nationally, with 22.8 percent support to Carson’s 17.3 percent and Fiorina’s 11 percent, according to the latest RealClearPolitics average of polls.