What other actors have switched to politics?

With Fred Thompson deciding to read for the part of Republican presidential nominee, we thought we'd see how the pickup-driving former senator and "Law & Order" star stacked up against others who used their SAG cards to gain political favor.

[The list includes: Helen Gahagan Douglas, Ronald Reagan, Arnold Schwarzenegger, Sonny Bono, Clint Eastwood, Fred Grandy, Jesse Ventura, Ben Jones.]