Has there been a clean presidential election since Eisenhower?
Even in 1952 and 1956 you already had corrupt Demonrat urban machines (and in states like TX, corrupt rural Demonrat machines). Probably have to go back to 1924 or 1928. Dems put up a centrist nominee in 1924 for President and the left lost their minds. That was the first and last time since 1892 that the party didn’t put up a left-winger. Urban/Dem cheating was at a minimum that year.