GOP:Scott Walker ................................................... 17%Ben Carson..................................................... 12%
Chris Christie .................................................. 12%
Rick Santorum................................................ 12%
Mike Huckabee ............................................... 11%
Jeb Bush......................................................... 9%
Marco Rubio ................................................... 9%
Ted Cruz ......................................................... 6%
Rand Paul ....................................................... 6%
Someone else / Not sure ................................ 6%
DEMs:Hillary Clinton.................................................. 63%Bernie Sanders ............................................... 14%
Martin O'Malley............................................... 6%
Lincoln Chafee................................................ 3%
Jim Webb........................................................ 3%
Not sure .......................................................... 12%
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Public Policy Polling® surveyed 799 registered voters, including 385 Democratic primary voters and 334 Republican primary voters, from May 21st to 24th. The margin of error for the overall survey is +/- 3.5%, for the Democrats it’s +/-5.0%, and for the Republicans it’s +/-5.4%. 80% of interviews for the poll were conducted over the phone with 20% interviewed over the internet to reach respondents who don’t have landline telephones.
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http://www.publicpolicypolling.com/pdf/2015/PPP_Release_PA_52815.pdf