Three of these elections were lopsided victories, both in the popular vote and the electoral college: Grant over Seymour in 1868, Roosevelt over Landon in 1936, and Johnson over Goldwater in 1964. The other three victors on November 3, McKinley, Taft and Clinton, all won respectable majorities, but not in landslides. William Jennings Bryan was the loser in both 1896 and 1908, as he had been in 1900.
Two of the elections pitting an incumbent against another candidate -- Roosevelt in '36 and Johnson in '64. Both won. Only one November 3 election ever unseated an incumbent president, when Bush lost to Clinton in 1992.