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In 1920, Republican Ohio Sen. Warren Harding called for a return to "normalcy". He won 404 electoral votes and more than 60 percent of the popular vote, defeating Democratic challenger Ohio Gov. James Cox. Harding died in 1923, leaving the office to Vice President Calvin Coolidge. This was the first election in which women were allowed to vote.

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In 1928, Republican Secretary of Commerce Herbert Hoover beat Al Smith, the Democratic Governor of New York, in a landslide. The Republican won 40 states and 444 electoral votes, while Smith won just 87 electoral votes from 8 states. Hoover won by more than 6 million votes.

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In 1936, incumbent President Franklin D. Roosevelt won in the most lopsided election in the history of the U.S. Republican challenger Kansas Gov. Alf Landon carried just two states for 8 electoral votes; Roosevelt won 523 electoral votes and more than 60 percent of the popular vote.

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In 1944, President Franklin D. Roosevelt won his fourth and final term against Republican New York Gov. Thomas Dewey. The president won 36 states for 432 electoral votes and around 53 percent of the popular vote. He died a few months into his fourth term, and Vice President Harry Truman took over the presidency.

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In 1952, war hero Gen. Dwight D. Eisenhower beat Democratic Illinois Gov. Adlai Stevenson with 442 electoral votes to Stevenson's 89. Eisenhower won 39 of the 48 states and easily won the popular vote by nearly 11 percent.

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1960 marked one of the closest elections in terms of the popular vote. Massachusetts Sen. John F. Kennedy beat Vice President Richard Nixon by just over 110,000 votes nationwide or .2 percent of votes cast. Nixon won 26 states to Kennedy's 22; Virginia Sen. Harry F. Byrd won 15 electoral votes, including the states of Alabama and Mississippi. 1960 marked the first time residents in Alaska and Hawaii could vote.

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In 1968, Vice President Hubert Humphrey (who had replaced Robert F. Kennedy on the Democratic ticket following his assassination months earlier) lost to former Vice President Richard Nixon, 191 electoral votes to 301. The popular vote was much closer, as Nixon beat Humphrey by just half a million votes. Former Alabama Gov. George Wallace, running as an independent, garnered 13.5 percent of the popular vote, winning five southern states for 46 electoral votes.

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In 1976, former Georgia Gov. Jimmy Carter beat incumbent President Gerald Ford despite winning fewer states. Carter won 23 states plus D.C. for 297 electoral votes; Ford won 27 states for 240 electoral votes. Carter won the popular vote by about 1.7 million votes. It was the last election in which a Democrat swept the Deep South.

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In terms of electoral votes, 1984 was the second most lopsided presidential race in U.S. history as incumbent Ronald Reagan won 49 states for 525 electoral votes. His Democratic rival, former Vice President Walter Mondale, won only his home state of Minnesota and D.C., giving him 13 electoral votes. Reagan won the popular vote by about 17 million, or more than 18 percent of the total votes cast.

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In 1992, Democratic Arkansas Gov. Bill Clinton defeated President George H.W. Bush with 370 electoral votes to Bush's 168. Reform Party candidate Ross Perot drew more than 19 million votes (18.9 percent of the popular vote), the strongest showing by a third party candidate in 80 years. Bush won just 37.5 percent of the popular vote, the lowest for a sitting president in 80 years.

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In 2000, Texas Gov. George W. Bush defeated Democratic Vice President Al Gore in one of the closest elections in U.S. history. Bush beat Gore 271 electoral votes to 266. Bush won 30 states to Gore's 20 plus D.C. Gore won the popular vote by more than half a million votes (48.4 percent to Bush's 47.9 percent).

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In 2008, Barack Obama won the presidential election against Sen. John McCain to become the first African American president of the United States. Obama won with 365 electoral votes to McCain's 173, winning 28 states plus D.C., while McCain won 22. Obama also won the popular vote by nearly 10 million.