You made this comment to yourself in comment# 6.
Goldwater made two huge mistakes.
He did not vet his VP candidate enough, so the dims brought up Engleton had been hospitalized with depression.
Don't you read links? Check the links in comment# 9. William E. Miller, who nobody heard of, ran with Barry Goldwater in 1964. "Democratic nominee George S. McGovern's presidential hopes virtually evaporated when it was revealed shortly after the party convention that his newly chosen vice presidential running mate, Missouri U.S. Sen. Thomas F. Eagleton, had been hospitalized on three occasions for depression and had undergone electroshock therapy."