Casey leads GOP rival in Pennsylvania Senate race: Poll

Pennsylvania Sen. Bob Casey (D) leads his Republican challenger David McCormick six months out from Election Day, according to a new Emerson College/The Hill swing state poll released Tuesday. 

The poll found 46 percent of Pennsylvania voters said they backed Casey in the race, while 42 percent said they supported McCormick. Another 12 percent said they were undecided. The gap between the two candidates remained unchanged from when the last Emerson College/The Hill poll was conducted last month.