Santorum steps off the campaign trail

Rick Santorum spent more time on the campaign trail than any of the other candidates vying for the GOP presidential nomination. But, in the end, he discovered that visits don't necessarily translate into votes -- or delegates.

Santorum vs. Romney

SOURCE: PBS NewsHour, AP. GRAPHIC: Ted Mellnik, Laura Stanton and Karen Yourish - The Washington Post. Published April 10, 2012.