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 considered a bellwether up until 2008, Missouri trended in the early 21st century toward the Republicans, 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 Democrat to ever win two terms in the White House without carrying the state either time.
