Dean Fails to Bring New Voters

I've noticed that many Deaniacs argue that Dean is more electable than other candidates because he brings new voters to the party.  The polls in Iowa, however, seem to indicate that most of these "new voters" never showed up.

If these new voters aren't excited enough about Dean in the places that know him best, I think it's time to rethink the argument on Dean's general election electability.