The 2012 Missouri Republican Presidential Primary's results were nonbinding on the state's national convention delegates. Voters in Bollinger County supported former U.S. Senator Rick Santorum (R-Pennsylvania), who finished first in the state at large, but eventually lost the nomination to former Governor Mitt Romney (R-Massachusetts). Delegates to the congressional district and state conventions were chosen at a county caucus, which selected a delegation favoring Santorum. Incumbent President Barack Obama easily won the Missouri Democratic Primary and renomination. He defeated Romney in the general election.
