The thing they shouldn't do is half-ass it with a small spend.
I have a feeling this is exactly what's going to happen. They'll know it's not too competitive because Hillary>Obama here, but then they'll realize they have such a small chance of winning the Presidency, they'll try to save Toomey and thus the Senate is a last ditch effort. It's just a disaster waiting to be mismanaged yet again.
Romney repeating McCain's last minute Pennsylvania gambit was quite amusing. You'd think they would just contest it from the beginning.
The pathetic thing was that they were going for a "blowout" by contesting PA, they actually believed the right wing talking points about skewed polls and thought they had the EV in the bag.