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Defense never wins a war.
Obama's campaign should start to attack McCain personally on all fronts: TV Ads, Radio talk shows, Blogs and newspaper columnists.
Burn the money to buy adspace, and if comcast or other companies refuse, shout out loud about discrimination and inquiry into comcast, etc.
State that McCain was a coward in getting himself be captured when kennedy fought. Similarly question McCain's mental health and battle fatigue in prime-time TV for his irrational changes in policy. Make a psychologist state on TV that sudden anger shows signs of mental instability and he would love to examine McCain.
Periodically state McCain's age as a reason for being senile and how he gets disablement benefits by cheating taxpayers.
In short, make McCain's campaign scramble to defend itself. This will quickly burn out remaining money of McCain and force him to use illegal means to get more money.
This move can again be exploited by Obama to complain and strike McCain off the rolls.
Obama should think Blitzkreig and not zone defense he is playing now.
Attack is the best defense and quantity has its own quality.