America, are you ready for Rush Limbaugh in an electric car? The conservative talk show host has agreed to take Jay Leno's "Green Car Challenge." In the segment airing next Thursday on NBC's "Jay Leno Show," Limbaugh will race an electric Ford Focus around a custom-built track beside Leno's studio, the show's representative confirmed. The "Green Car Challenge" segment makes its debut on the primetime show tomorrow night. Celebrities who participate drive two times around the twisty track, which takes a little less than a minute to complete. By the time Rush gets behind the wheel of the zero-emission vehicle,...