The story is (repeated here by Martin's daughter Deana) that Dean Martin didn't attend JFK's inauguration out of support for Sammy Davis. I personally don't believe it. My suspicion is that Dean just didn't like JFK (I've never seen him in the celebrity campaigns for JFK, either, and THAT wasn't done out of support for Sammy, who was present). He seemed to be a pretty astute fellow...sold his interest in the Cal-Neva casino before the feds stripped Sinatra of his co-interest (and we know what happened between Sinatra and JFK). Not trusting JFK was a wise move on his part...