Top Santorum donor cracks Romney joke at CPAC, gets booed

"There's a little bar a couple door downs, and recently a conservative, a liberal, and a moderate walked into the bar. The bartender says 'Hi, Mitt,' " Friess joked as a mix of boos and applause rained down from the crowd.

Friess has been a major contributor to the pro-Santorum super-PAC, the Red, White, and Blue Fund.

For more on the GOP presidential race, click here.