i don't really buy the vote for the most electable candidate pitch. electability is really hard to predict. and the fact that someone is polling well now, particularly when he isn't getting as much attention (and by that i mean negative attention) as the leading candidates, doesn't mean that the polling lead wouldn't evaporate once he gets the spotlight and the attacks begin.
but provisos aside, check out this chart. it really is remarkable that the two strongest candidates according to this poll--edwards and mccain--are polling the least well within their respective parties. edwards is definitely not out--he's within the margin of error of winning iowa--but i think that mccain is.