The rule is, republicans generally need at least 25% in Philly and they have to at a minimum, split the burbs surrounding Philly county. In Pitt, Toomey will do slightly better, but he will get mauled in SE Pennsylvania.
If Sestak has any type of moderate appeal, he will also eat into central PA too.
Pretty much agree. I use to have this argument with Phil all the time. No one Republican or Democrat has won statewide in decades (perhaps ever) without winning suburban Philly. Now with some of the gains the GOP has made out west perhaps they can afford to lose suburban Philly and still win statewide. However, they at least need to be able to put up a fight there and be competitive. Toomey can't and would get mauled there, especially against Sestak, and the margins would be just too much to overcome.