Somebody has a faulty memory. Sinatra didn't meet Farrow until 1964. Married her in 1966. Kennedy was killed in 1963.
Kennedy used Sinatra's celebrity to get votes. Sinatra used Kennedy to get cachet and to be among "the elites" (if you can call Kennedys that).
After Kennedy got elected he cast Sinatra aside due to his mob ties, which was, clearly, known beforehand (i.e. Chicago).
Sinatra was a mixed bag but he did - with his own and not taxpayers' money - send money, usually anonymously, to hardship and often tragic cases of people down on their luck - a widow, someone whose house burned down, paying for someone's funeral, etc.
Bump