Yahoo Rick Santorum couldn't get over his dismal showing in the Iowa caucuses.

CNN Politics "We decided that we wanted to find a candidate that really espoused the values that we believed in, someone who really focused their campaign on trying to help ... those who are struggling on the margins," Rick Santorum says. "That's why we decided Read more ... to support Marco Rubio," he added.

CNN Politics "We decided that we wanted to find a candidate that really espoused the values that we believed in, someone who really focused their campaign on trying to help ... those who are struggling on the margins," Rick Santorum says. "That's why we decided Read more ... to support Marco Rubio," he added.

CNN Just in: Rick Santorum has endorsed Marco Rubio for president.

Yahoo News Rick Santorum throws his support to Marco Rubio.

Yahoo News Rick Santorum had a dismal performance in the Iowa caucuses – receiving only one percent of the vote resulting in zero delegates.

HuffPost Media Santorum's controversial thoughts on issues related to sex, marriage and contraception spanned all the way back to at least 2003.

Jesse Field I think in honor of Stephen Colbert and Rick Santorum's new candidacy for president. We must bring back Urban Dictionary's "santorum"! http://www.urbandictionary.com/define.php?term=santorum&defid=942955

CNN Politics This time, says a senior Santorum adviser, Santorum is the candidate with an advantage: He's got a team in place and he's done it before.

Salon There's a little problem with Santorum's attempt to rebrand himself as a populist champion of the blue-collar working man...