Rick Santorum is no longer seeking to be the Republican nominee but instead is backing another candidate.

"We wanted to find a candidate that espoused the values we believe in," Santorum said on Fox News. "That's why we decided to support Marco Rubio."

Santorum won Iowa four years ago but this time came in eleventh. Rubio surprised most pundits with a very strong third-place finish.

"I don't endorse lightly," Santorum said, noting that he has been in politics for 25 years -- perhaps a factor in his weak showing in an election cycle that is favoring the outsider.