Well come on. John McCain cancelled his interview with CNN after Campbell Brown said something about Sarah Palin he didn’t like.
Ah, so a personal attack is the same as a question about voter registration fraud (especially when Obama is closely associated with said group).
Were you being sarcastic? If so, sorry. If not, well, here goes: There was a big difference. McCain was angry over a personal attack. The Obama campaign is angry because their policies are being exposed by the questions.