Donald Trump and Ben Carson, two outsider candidates who continued to lead the Republican presidential field, are just 1 percentage point apart from each other in a new poll of Pennsylvania Republicans.

The latest Franklin and Marshall College survey of likely Republican primary voters in the Keystone State shows the outspoken billionaire leading Carson, a retired neurosurgeon, 23–22 percent. Florida Sen. Marco Rubio comes in third at 13 percent while 20 percent of Republican voters in Pennsylvania remain undecided.

Former Florida Gov. Jeb Bush and businesswoman Carly Fiorina tied for seventh place with 3 percent each, and a handful of other GOP candidates, including former Pennsylvania Sen. Rick Santorum, received only 1 percent support among right-leaning primary voters in the state.

On the Democratic side, former Secretary of State Hillary Clinton maintained a big lead over her closest rival, Vermont Sen. Bernie Sanders. Clinton drew 52 percent support among Pennsylvania Democrats while the socialist senator earned 18 percent. The only other Democratic candidate, former Maryland Gov. Martin O'Malley, polled at zero percent.

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