they not only used the mob to get elected, once they were in power they set out to destroy the mob. Frank Sinatra is luck he didn't get whacked.
I think mob job, lots of connections. Not the least of which is one Jack Ruby, a fatally ill mobster that bought somebody out to get to Oswald. The miracle bullet, the laws of physics, witnesses dying and several other factors lead me to believe that the Warren Commission was a joke.
Sorry, looks like Boland beat me to the punch on this one