Can we choose the obvious who are already in politics? Bunning and Bradley?
Chirs Kluwe would be good and doesnt stand for political BS and has spoken out about it publicly many times.
Or someone with a big heart who wants to do the right thing for everyone.... Brees, Favre, Agassi, Flutie, Warner, Hamm, Yamaguchi, ..... Those are on the top of my head and seem to be the most compassionate