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BALLWIN, MO - MARCH 17: Republican presidential candidate, former U.S. Sen. Rick Santorum waves to supporters and caucus voters during a campaign stop March 17, 2012 in Ballwin, Missouri. Rick Santorum will compete in Missouri's caucus today after winning a non-binding primary held in the state on February 7. (Photo by Whitney Curtis/Getty Images)
BALLWIN, MO - MARCH 17: Republican presidential candidate, former U.S. Sen. Rick Santorum waves to supporters and caucus voters during a campaign stop March 17, 2012 in Ballwin, Missouri. Rick Santorum will compete in Missouri's caucus today after winning a non-binding primary held in the state on February 7. (Photo by Whitney Curtis/Getty Images)

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    Santorum: You can't trust Romney

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Santorum: You can't trust Romney

Rick Santorum said Mitt Romney is untrustworthy because of his support of government-run health care.

Santorum: You can't trust Romney

Rick Santorum said Mitt Romney is untrustworthy because of his support of government-run health care.