Who's been bought off by billionaires? Mitt Romney and Barack Obama lead the pack; only Ron Paul isn't bought and paid for

Number of billionaires who donated:

Mitt Romney: 42

Barack Obama: 30

Rick Perry: 12

Jon Huntsman: 12

Newt Gingrich: 4

Herman Cain: 4

Michele Bachmann: 2

Rick Santorum: 1

Ron Paul: 0

Source: Washington Post