I trust Bush, but not Specter.
Specter screwed us with the Bork nomination. Specter screwed us with the Clinton impeachment. And you want to give him another chance? Be my guest, but I'll have none of it.
No, I just think Bush would be able to exert sufficient pressure on Specter. The threat to remove him from Judiciary Chair if he renigs on an agreement with Bush could be held over his head to force him to comply. Specter's going to have to pay Bush back for his re-election when Bush comes knocking at his door.
Despite Specter's past, the whole GOP Senate screwed President Bush for the last 2 years.