The entrenched incumbents protect their own, so this will be a steep uphill battle.
The other thing that must be done is to write to any other senators and repubs we find out who are backing McCain and tell them we’re going to toss their ass out as well. We need to make sure the RNC knows that we will give them no money if they back McCain.
Of course many of use won’t anyway after what they’ve done with Specter and (for me) putting up McCain in 08 and costing us the election.