Not respond to the tidal wave of advertising against him? Inevitably lose the election? Turn the election into a demonstration of what happens if you don't let money rule politics? Let the monied interests run rampant with the subsequent elected majority?
The issue was that Obama blessed a super PAC officially and his cabinet and campaign folks talked to the donors at their meetings.
http://www.politico.com/news/stories/0212/72531.html