Pennsylvania’s state primary is coming up on Tuesday, and Republicans are worried that their leading candidate for governor may cost them the seat. State Sen. Doug Mastriano is currently leading a crowded race. A Tuesday survey had Mastriano leading the field with 29% of the votes. Former U.S. Rep. Lou Barletta, who many pegged as the favorite to snag the GOP nod, was a distant second at 17 percent. Trailing Barletta was Bill McSwain at 13 percent and Dave White at 11 percent. Though he is leading the current polls, state Republicans are concerned that his beliefs are too extreme to beat the u…