Despite the union between the Liberal Republicans and Democrats, Greeley proved to be an ineffective campaigner and Grant remained widely popular. Grant decisively won re-election, carrying 31 of the 37 states, including several Southern states that would not again vote Republican until the 20th century. Grant would be the last incumbent to win a second consecutive term until William McKinley's victory in the 1900 presidential election, and his popular vote margin of 11.8% was the largest margin between 1856 and 1904.