Yeesh, I got Obama as well, and I thought I was being fairly conservative in my choices. Kucinich was also my #2, followed by Rep. Ron Paul (never even heard of him, to be honest), Sen. Joe Biden, and Newt Gingrich (no f'n way I'd ever vote for him, although his views seem to have become much more mainstream over the last five years).
Tommy Thompson really should be on there...he'd be a good option as a fairly moderate Republican with a good track record as a governor of a Democratic leaning "swing state" (if you can call Wisconsin that after the last few elections), but his ties to the Bush administration would make his candidacy questionable.