The only explanation is that someone at the pro-Dewhurst super PAC cynically thought an accusation of being "pro-amnesty" would be especially explosive aimed at a Hispanic candidate because it feeds into existing prejudices.

CNN: GOP's problem with Latinos -- as big as Texas

Meanwhile, only three billionaires have contributed at least a quarter of a million dollars to Priorities USA, the largest pro-Obama Super PAC.

NEWYORKER: Schmooze or Lose

That same weekend, the Huffington Post later revealed, two hundred wealthy guests attended a nearby luncheon featuring a speech by Karl Rove, the architect of American Crossroads, the pro-Romney Super PAC.

NEWYORKER: Schmooze or Lose