I'm not sure if I've ever seen a president campaign for someone other than the incumbent in his party.
My guess is that the President probably wouldn't have minded having Pat Toomey in there, as being more conservative than Specter, and if Toomey had been the incumbent, GW would have been there for him. Just my thought.
Exactly. The President politically is most concerned with strengthening the Republican Party. He wasn't about to risk losing a Senate Seat in Pennsylvania to replace one Republican with another. He needed every Republican he could get to have the votes to get his nominations through. So far Arlen has done a good job as Chariman.
I agree with you about the power of the incumbency. At the risk of sounding like Biden, and the Dems, it doesn't mean I always agree or fully understand continuing to do it, but I was saying it pretty much tongue in cheek. :)