A brief history of Rick Santorum thoughts on Mitt Romney

It's a predictable part of presidential campaigns that candidates say harsh things about their competitors in primary elections but then eat those words when they have to endorse the victor.  It's chow time for former U.S. Sen. Rick Santorum.

The Republican National Committee just announced that Santorum will be one of the "headliner" speakers at the party's convention in Tampa, which starts Aug. 27.  Here's a statement the RNC released on Santorum's behalf:

"I am so passionate about this election because the core principles of our country are at stake. The Republican National Convention is an important time for us to rally behind Mitt Romney and his vision to put our country back on track. We need a leader in the White House who is committed to reforming government."

SantorumExposed.com, a web site set up in 2005 to target the then junior senator from Pennsylvania as he was challenged by Bob Casey Jr., is still around and was keeping track as Santorum vied for the Republican nomination for president this year.  In a video released to YouTube Friday, SantorumExposed.com shows Santorum endorsing Romney for president in 2008, then ripping him repeatedly this year, then endorsing him again after dropping out of the race.

The cognitive dissonance gets pretty deep about two and a half minutes into the video, when Santorum asks: "Are you going to vote for someone that says one thing one day and says anything that’s necessary the next day to win? Or are you going to vote for someone you trust?"

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