Herman Cain is no longer running for president. He doesn't think he's likely to be picked as the eventual nominee's running mate, either. But he does have a Cabinet post in mind should the GOP win the White House next fall: secretary of Defense. [....] Cain shared the idea with ABC's Barbara Walters during her annual special on the "10 Most Fascinating People." And the veteran journalist was just a bit surprised. Cain said he thought he'd be a good pick because he wants to "influence rebuilding our military the way it should be." Walters, still stunned, reminded Cain of...