This is the Democratic party we're talking about. If they see an opportunity to blow an election, they'll gleefully grab hold.
Hillary is the Ed Muskie/Hubert Humphrey of this campaign. She is in the role smiled upon by the Democratic establishment. The longer this drags on, the dumber the media gets re: Obama's reverend, lapel pin, etc, the more times she can say "Obama doesn't win the big ones!", the more desperately the old-guard of the party will cling to their past. While none of this gurantees Hillary a win, it does pose a major problem for Obama in that it extends the race (helps McCain, too) and allows doubts about his November chances to solidify.