2010 Census Reapportionment: Missouri lost one electoral vote, giving it 10 through the 2020 presidential election.

Missouri gained statehood in August 1821. A Midwestern state bordering the south, Missouri has, until recently, been a true battleground state with amazing historical accuracy at voting for the ultimate election winner. From 1904 through 2004, Missourians got it wrong just once – preferring Adlai Stevenson over Dwight Eisenhower in 1956. In 2008, the streak ended when Barack Obama lost to John McCain by the slenderest of margins…49.4% to 49.3%, or about 3,900 votes out of 2.93 million cast. However, in 2012, the vote wasn't close, with Mitt Romney beating Barack Obama by almost 9.5%. With 2012 being the fourth consecutive Republican victory, the state may be moving into a 'leaning Republican' category. Like many Midwestern states, population growth has been slower in recent decades than the country as a whole, resulting in declining electoral influence. From a peak of 18 electoral votes just prior to the Great Depression, Missouri has been reduced to 10 today.