like Obama taking money from companies despite opposing the Citizen's United verdict
It's still illegal for corporations and unions to give money to political candidates' campaigns, or coordinate their own spending with those campaigns. They are free to give money to advocacy groups to run ads with a political message, or run their own ads, but that's not the same thing.
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?
It's still illegal for corporations and unions to give money to political candidates' campaigns, or coordinate their own spending with those campaigns. They are free to give money to advocacy groups to run ads with a political message, or run their own ads, but that's not the same thing.