"When a communist assassinated President Kennedy, somehow the American right got the blame. Lyndon Johnson translated that myth into a campaign of slander against Barry Goldwater, casting him as a crypto-Nazi emissary of "'hate.'"
First of all, no one accused Goldwater of being a "crypto-Nazi emissary of hate." The main concerns raised about Goldwater were that he might get us into a nuclear war, at a time when tensions were high, and that he opposed the Civil Rights Act.
Among those on the left who promoted outlandish conspiracy theories on the assassination of President kennedy, some claimed Lyndon Johnson was involved but Goldwater was never mentioned.