When Philadelphia Inquirer reporter Jonathan Tamari got a tip that Pennsylvania U.S. Sen. Pat Toomey would be leaving politics after his current term, he was surprised. If he didn’t run for reelection to the Senate, Toomey was widely expected to run for governor. Without him, Pennsylvania Republicans are scrambling. Toomey still has two years left on his term, but his announcement comes just weeks before the presidential election. Jonathan explains why the pick to fill Toomey’s shoes could depend on how Pennsylvania swings in 2020.