This has already scrolled off of daily kos, but yesterday they had a poll of people guessing which were the easiest and the toughest matchups from a Dem perspective in the prez race. While McCain was generally viewed as the toughest opponent, the most popular combo, viewed as easiest, was Obama versus Huckabee. I want to warn that this might be one of those desires one curses having fulfilled.
Key here is my post here earlier on "Who is a 'Populist'?" Among current candidates, they were Edwards, now looking near dead, and Huckabee. Obama is the New Centrist Dem, who does not appeal to poorer people so much, a sucker for a "Reagan Democrat" approach from the guitar playing, Colbert-appearing, Huck. He is ahead of both Romney and McCain in Michigan in the latest polls, and could get the nomination. Nice guy that he is, at least on the surface, he could go all the way. And, lest anybody forgets, his fundamentalism is right in there with the old-timey populists: think William Jennings Bryan. (And, don't forget that lots of Dems in 1980 were hoping for Reagan to get the GOP nomination.)