I suppose Strom Thurmond and other fringe candidates might lay claim to the title, but Breckenridge walked the walk:
John Cabell Breckinridge (January 16, 1821 – May 17, 1875) was a lawyer, U.S. Representative, Senator from Kentucky, Vice President of the United States, Southern Democratic candidate for President in 1860, a Confederate general in the American Civil War, and the last Confederate Secretary of War. To date, Breckinridge is the youngest vice president in U.S. history, inaugurated at age 36. He is also remembered as the Confederate commander at the Battle of New Market, where young VMI cadets participated in the battle on the Confederate side. He was the grandson of U.S. Senator and Attorney General John Breckinridge and the father of congressman and diplomat Clifton Rodes Breckinridge. His great-grandson, John Cabell "Bunny" Breckinridge, was an actor.
http://en.wikipedia.org/wiki/John_C._Breckinridge