Needs to be forced to resign, nothing else will suffice. If he does not, then the overly apparent hypocrisy of the Rats will be plain for everyone to see.
The timing works against him. The democrats are still licking their gaping wounds from the Nov elections and Obama is already campaigning for 2012.
Under normal democrat standards, they would circle the wagons and protect him. But not now. He’s radioactive and they are going to want to wash themselves of it fast.