I pretended to be a Democrat this morning and voted for Barack-- basically, for exactly the same reasons outlined by Megan McArdle. Bush-Clinton-Bush-Clinton just sounds downright un-American; we're not a Monarchy. Besides, Barack is inspiring and, it seems to me, if he screws up he's the least likely presidential candidate to screw things up in a really big way.
I would have voted for Ron Paul, but I decided to be reponsible instead. Ron Paul would be great, if only he wasn't such a nut. It's OK to be a nut if you know that your ideas are kinda nutty (reference: Penn Jillette); it's not OK if you take yourself too seriously.