A landslide? Surely you jest!
Popular votes
Lyndon Johnson's 61.1% to Barry Goldwater's 38.5% in the 1964 presidential election
Franklin D. Roosevelt's 60.8% to Alf Landon's 36.5% in the 1936 presidential election
Richard Nixon's 60.7% to George McGovern's 37.5% in the 1972 presidential election
Warren Harding's 60.3% to James M. Cox's 34.1% in the 1920 presidential election
Ronald Reagan's 58.8% to Walter Mondale's 40.6% in the 1984 presidential election
Theodore Roosevelt's 56.4% to Alton B. Parker's 37.6% in the 1904 presidential election
Electoral votes
James Monroe's 231 electoral votes to John Quincy Adams's 1 electoral vote in 1820. (99.2% margin)
Franklin D. Roosevelt's 523 electoral votes to Alf Landon's 8 electoral votes in 1936. (97% margin)
Ronald Reagan's 525 electoral votes to Walter Mondale's 13 electoral votes in 1984. (95.2% margin)
Richard Nixon's 520 electoral votes to George McGovern's 17 electoral votes and John Hospers's 1 in 1972. (93.3% margin)