They called it immediately for Casey. They usually have a damn good idea right before 8 as to how many people turned out in Philly. If the Dems hit their quota, they usually call the race but the key word there is usually: I believe they hit their quota in 2010 but the beautiful wave across the rest of the state swept Toomey in.
The issue tomorrow is concern with turnout in Philly. There isn't much of a Wolf operation, he's refusing to give out the legendary street money for Dem workers and there's too much of a feeling that Wolf has it in the bag (ever wonder why he brought in the President, FLOTUS, Hillary, Bill?). Now I, for one, think Corbett is too passionately hated here for their turnout not to hit the mark but for argument's sake, if it doesn't, they'll hold off a bit on making a declaration. I'd be floored if it isn't called by 9.
