Murdering the Mayor of Paradise

"Although Goldwater liked to believe his associations with Greenbaum and Bioff wouldn’t have an impact on his presidential dreams, he was wrong. The connection would dog Goldwater to his obituary in 1998."

Goldwater lost in a landslide in 1964, mostly because he was running against the heir to a very popular president and because the old New Deal coalition was not dead, partly because the media depicted him as dangerous. I doubt he lost any votes at all over ties to mobsters.