Biggest presidential election win

United States presidential election of 1964

Lyndon B. Johnson and Hubert Humphrey won 61.1% of the national popular vote, which remains the highest popular-vote percentage over a race with actual opponents.

United States presidential election of 1820

President James Monroe and Vice President Daniel D. Tompkins ran effectively unopposed and were re-elected at 80.6%. The previous two presidential elections of 1789 and 1792, which George Washington ran without serious opposition.