Hillary is waaaaaaay too divisive a figure to ever be considered for the Presidency. Just the mention of her name illicits strong, and usually negative, responses from the wing nuts. In addition not many know that she is really disliked by the hardcore Left in this state, not only for her pro Iraq war vote but for her ability to use and abuse issues cosmetically for her political gain. Look for a Howard Dean type collapse in '08 from her.
Obama would be a natural save for one fact....he's a negro. Very articulate, somewhat moderate and a dazzling smile don't make up for the fact that there still exists states like Tennessee and other spots of unenlightenment that wouldn't vote for him even if he were running against the Mighty Macaca.
I like Feingold and would vote for him in a primary.