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ZANESVILLE, OH - MARCH 05: Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets an overflow crowd during a campaign rally at Bryan's Place on March 5, 2012 in Zanesville, Ohio. With one day to go before Super Tuesday, Mitt Romney is making one final push through Ohio. (Photo by Justin Sullivan/Getty Images)
ZANESVILLE, OH - MARCH 05: Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets an overflow crowd during a campaign rally at Bryan's Place on March 5, 2012 in Zanesville, Ohio. With one day to go before Super Tuesday, Mitt Romney is making one final push through Ohio. (Photo by Justin Sullivan/Getty Images)

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Santorum wishes Romney 'happy birthday'

GOP presidential candidate Rick Santorum wishes Mitt Romney a "happy birthday." CNN's John King has more.

Santorum wishes Romney 'happy birthday'

GOP presidential candidate Rick Santorum wishes Mitt Romney a "happy birthday." CNN's John King has more.