Why Jim Webb and not Wes Clark?

This diary is mostly a question, and I'd like to hear from people who really know these two men in depth.

I don't understand why there is such a strong support amongst progressives for Jim Webb--and he's supposedly on all the short lists--while it seems that Wesley Clark is only occasionally mentioned, and rarely comes up when the "short list" is the subject.

Don't get me wrong--I live in Virginia and I love Jim Webb. But that's kind of why I'm asking the question. Why are people so eager to pull a guy out of a former Republican-held Senate seat that he is likely to be able to hold onto for as long as he wants to remain in public life, when we have a brilliant man with comparable--perhaps greater--military credentials, who is not already a Democratic officeholder.

I think that many Clark 04 supporters are currently in the McCain camp at this point. I also think that Wes Clark and Obama together would possibly present the highest combined IQ we've ever had in the White House.

So, what's the downside?