2012 United States presidential election in Missouri

The 2012 United States presidential election in Missouri took place on November 6, 2012, as part of the 2012 United States presidential election, in which all 50 states plus the District of Columbia participated. Missouri voters chose 10 electors to represent them in the Electoral College via a popular vote pitting incumbent Democratic President Barack Obama and his running mate, Vice President Joe Biden, against Republican challenger and former Massachusetts Governor Mitt Romney and his running mate, Congressman Paul Ryan.

Missouri was won by Romney, who took 53.64% of the vote to Obama's 44.28%, a margin of 9.36%. Although it was a battleground in past elections, and even a bellwether up until 2008, Missouri was and still is considered to be trending toward the GOP, having been the only long-time swing state to be won (albeit narrowly) by Republican John McCain in 2008. Consequently, the state was not heavily contested by either side in 2012, and Romney ultimately carried Missouri by the largest margin since Ronald Reagan's 1984 landslide. Romney ultimately became only the second Republican to carry Missouri and lose the presidency just four years after John McCain's narrow victory in the state with Obama also becoming the only elected president to win two terms in office and consecutively lose the state.