Back when Gore was running for his nomination, I always hoped he'd miraculously get McCain to accept an offer to be VP... This time around, I'm not sure Kerry will go with any of the other still-contending Democrating candidates. Dean ended up like a phoenix; burning brightly for a while, but eventually consuming himself in his own flames. Edwards might have too much pride to accept, even if it's offered (though I think he'd be an asset). Clark wouldn't really add much to the ticket, and having him would just turn into a pissing contest about military experience between Bush, Cheney (assuming he's staying on), Kerry, and Clark. Sharpton? Let's be serious here...
If he's smart, he'll pick someone who will help him pick up voters who he doesn't immediately appeal to, himself, without alienating too many of those he does. Trying to make history by having a "first" whatever (first African-American, first Woman, first Jew, first Muslim, first Hindu, et al.) may well appeal to that minority group; but at the same time, it will drive much of middle-america away from him. So I think he'll probably play it safe and end up choosing someone with a long political history that hasn't pissed off too many conservatives and independents.
So whom do I think Kerry should pick as his running mate ? I'm not 100% sure... but I think Dick Gephardt would be a good choice, so long as Kerry doesn't intend to make Bush's going into the Air National Guard to avoid active duty an issue (and I don't think he does). Gephardt will appeal to middle-Americans and to Americans, in general, who've seen middle-class manufacturing and service jobs disappear. He has a long enough history in politics that people will recognize the name, but has at the same time not been associated with much that's pissed many people off. There's a whole lot I don't agree with him on, issue-wise... as would be the case with anyone, really. But I think he'll appeal to good number of voters, complement Kerry's constituency, and is a generally affable guy who will come off as more appealing in any debates against Cheney (again, assuming Cheney remains Bush's choice for VP).
Just my thoughts,
cumhail