Forget about Pennsylvania. The GOP hasn't won that state since 1988. They've come tantalizingly close a time or two, but this won't be the year. It's kind of remarkable that the Keystone State is in play when the GOP has essentially been conceding it the whole time, but suddenly dashing in with less than three weeks to go will not do the trick.
I would love to be wrong here--a Romney win in Pennsylvania would make for a long night of weeping and gnashing of teeth over on MSPCP--but I just do not see it happening. Romney would need to clean up in the rural counties and beat the shenanigans you KNOW the Democrats will try to pull in Pittsburgh and Philadelphia.