for more info, see political prediction market moves at Intrade
right now looks like Clinton is back on top of Obama, altho both are looking like strong contenders for the Democratic nomination. McCain has inside track to take Republican nomination, tho still a dark horse to become President.
personally, i'd be quite happy with any of those 3 (especially over the current situation). i probably lean more center-left moderate (social progressive / fiscal conservative), however even tho i may disagree with McCain on some policies i think i'd have appreciation & respect for him as a leader.
would be great to see a race between McCain and either Clinton or Obama. all 3 have positives.