How many billionaires does it take to buy a presidential election? We’re about to find out. The 2012 campaign probably will be a battle between one group of millionaires and billionaires supporting President Obama and another group supporting his GOP rival.

Perhaps this was the inevitable result of the Supreme Court’s grotesque decision in Citizens United vs. Federal Election Commission in 2010, which opened the floodgates to unrestricted campaign money through super PACs. But I’m not sure. What if Obama had stuck to his guns and eschewed super PACs?