The problem the TV "pundits" have is that they don't have any Democrat running that is presidential material. Lieberman comes the closest is seems to be an adult. Dean comes off as a nutcase. Clark is a dazed and confused metrosexual and has no business in the race. Edwards is a girl. Kerry seems to be running more for his wife more than himself. The rest are just not worth talking about.
Basically, unless they run Hillary the Democrats might as well call it a night. As far as getting their base excited about any one candidate.