Watching the fight unfold between President Barack Obama and Senate Republicans over who should choose the next Supreme Court justice, Michael A. Bowden got angry at what he saw at the latest affront to the first black president. And then his thoughts turned from Washington to his own state. Obama won't be on the ballot this fall, but Pennsylvania GOP Sen. Pat Toomey will - and Bowden has made defeating him in November a priority. [...] Democrats are pressuring senators in Pennsylvania, Ohio, New Hampshire, Illinois and Wisconsin to back down from their refusal to confirm or even consider Obama's...