Pennsylvania Sen. Bob Casey (D) is leading by 9 points in his Senate reelection bid against Republican challenger David McCormick, a new survey found. The UMass Lowell/YouGov poll found Casey earning 48 percent support among likely voters while McCormick trails at 39 percent.

The battle for Pennsylvania’s 19 electoral votes may garner the most headlines nationwide, but the race for its U.S. Senate seat may determine whether Democrats will retain control of the upper chamber,