I picked this card up in Hawaii. Inscription on the back of the card reads: “Hawaii’s citizens voted in a presidential election for the first time in 1960, a year after statehood granted them the right to do so. John F. Kennedy, the winner of the election, came to the islands three years later. A highlight of his brief visit was his motorcade through Waikiki. Just five months later, in the same limousine in another motorcade, would come the young president’s tragic death.”
As for what happened to the car I found the following on Answers.com:
Following the assassination of President Kennedy, the 1961 Lincoln Continental 4-door convertible became the most famous car in the world. In the weeks after the assassination the car was impounded for evidence. Over the years the car was modified several times, including re-armouring of the rear passenger compartment. It remained in use as a presidential parade car until the mid seventies. It was used occasionally by Presidents Johnson, Nixon, Ford and Carter. It was permanently retired in 1977 and is now on public display at the Henry Ford Museum in Dearborn, Michigan.