Facing a primary challenge from conservative J.D. Hayworth in Arizona, McCain volunteers to help the GOP establishment’s handpicked choice in Florida:

The 73-year-old senator said he hasn’t been asked by Florida Gov. Charlie Crist (R) to campaign for him in his GOP primary battle with former state House Speaker Marco Rubio (R), but that he would be willing.
Crist and then-Sen. Mel Martinez (R) gave McCain a critical endorsement in the waning days of Florida’s GOP presidential primary in 2008 that helped McCain defeat Romney and former New York City Mayor Rudolph Giuliani. Both dropped out of the primary race within days, clearing McCain’s path to the GOP nomination.
“Sure, I’d be glad to try to help him,” McCain said of Crist, who is under fire from conservatives for backing Obama’s stimulus package.

Florida, like Arizona, is a popular location for retirement. Hint, hint.