Top 10 most popular presidential candidates of all time

1) Donald John Trump 137,200,982 (won in 2016, lost in 2020)

2) Barack Hussein Obama II 135,414,311 (won in 2008 and 2012)

3) Richard Milhous Nixon 113,060,650 (lost in 1960, but won in 1968 and 1972)

4) George Walker Bush 112,496,612 (won in 2000 and 2004)

5) Franklin Delano Roosevelt 103,500,786 (won in 1932, 1936, 1940, and 1944)

6) Ronald Wilson Reagan 98,359,397 (he had some write-in votes in 1976 and then won in 1980 and 1984)

7) William Jefferson Clinton 92,311,074 (won in 1992 and 1996)

8) George Herbert Walker Bush 87,991,147 (won in 1988 and lost in 1992)

9) Joseph Robinette Biden Jr. 81,268,924 (won in 2020)

10) James Earl Carter Jr. 76,311,996 (won in 1976 and lost in 1980)

Wikipedia has a similar list but I didn't realize it until I had already started my own spreadsheet.  It does not list the election years, but includes many more candidates.  Scroll down about 2/3 of the page to "List of presidential candidates by lifetime votes".  I don't think there is a way to link directly to that section.  It shows the same rankings that I have, but the vote totals are slightly different.  There must not be a scientific consensus on how to achieve an accurate vote count.  They also left off President Franklin Pierce from the lifetime list.