Obama and Clinton do both come off as extremely personable, but they're hardly the only ones. Politics is the sort of field where personal charisma is, if not strictly necessary, at least incredibly valuable and regular. It's pretty rare to find a politician that is not personable IRL, Dick Cheney being a prominent example.
Hell, there are plenty of Republican politicians who are, by all accounts, delightful people to be around. Every person I know that's met Mike Huckabee, on either side of the aisle, says that he's one of the most amazingly likable people they've ever met.
Indeed.....even Dubya.......most who met him said he was amazingly personable.
