How is getting miffed, and changing political parties because the President decided not to come to stay in the new wing in your house...being loyal? Friends don't let things like that affect their relationships, nor cause them to change political alliances.
Dean Martin, though, had been a Republican all of his life and did not like the Kennedy's. He told Sinatra he was wasting his time and would never be accepted at the White House. Martin, reluctantly, went along with Sinatra in the election, but I would be willing to bet he voted for Nixon.
He refused to come to D.C. for the big Inaugural Gala Sinatra put on for JFK. Dean was the smart & cool one m=, not Frank.
Read Nick Touches book, “Dino”, a great bio on Martin.
You missed my point or I didn’t make it clear. His “conversion” to republicans was because he was very loyal to the dems and felt BETRAYED. It was felling that his loyalty was not appreciated. This is not an atypical human response. look at employees who give their all and get their jobs cit or they are replaced after years and then they tell stories about things that went bad in the company. When you take people’s work, friendship, and they feel you dumped on them, any reaction might be expected. At least Sinatra did not tell stories. he could have blow the Kennedy image to hell had he wanted.