Sarah Palin recorded a last minute robocall for Maryland GOP gubernatorial candidate Brian Murphy Monday.

Washington (CNN) - Republican Brian Murphy is heading into Tuesday's GOP gubernatorial primary in Maryland with a last minute robocall from conservative star Sarah Palin.

Just hours earlier, Sen. John McCain – Palin's former presidential running mate – had announced his support for Murphy's primary opponent, former Gov. Robert Ehrlich in an interview with the AP, saying Ehrlich is "a fine guy."

But the split is not surprising given the roster of candidates Palin has chosen to support this election cycle, as she has often broken with the Republican establishment. Her endorsement of Joe Miller in the Alaskan Senate GOP primary is widely credited with helping to propel the formerly little-known candidate to an upset victory over incumbent Sen. Lisa Murkowski.

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