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Huckabee's endorsement is as much a celebration of all things Rubio as it is a few jabs at Rubio's competitor, Charlie Crist, most specifically his support of President Obama's stimulus plan.
Rubio supprted Huckabee in the 2008 presidential primary, and the two dined together at Versailles (where fans chanted, "Who let the Huck out?" *wince*).