Of all the people who have spoken for either candidates at their convention Joe Liebermanis about the only one who didn't have anything to gain personally from supporting the candidate. Believe it or not, many of the former presidential candidates (and other political figures) have spoken out in support for the current candidate because they will not be able to run for president again (or even get much support from their party in the future) if they don't ...
Joel Lieberman may have only supported John McCain because of his friendship with John McCain, but (to me) that seems about as good of an endorsement as one can get.
Edit: made mistake on name, seen it in hundreds of news stories as Joel







