Casey for Obama

Obama picks up a huge endorsement in Pennsylvania from Governor Senator Bob Casey. This is important not just because Casey is obviously a big name in the state, but because he's a very credible figure among the White, working-class voters with whom Obama has struggled. Obama will hold his big city base in Philadelphia -- it all comes down to how much he can penetrate into Clinton territory mid-state and out towards Pittsburgh. Casey's endorsement is definitely a boon towards those efforts.