This question is weighted to Rat advantage--CAN Kerry beat Bush? Well, of course it's possible, whatever the likelihood might be.
But to vote 'no,' is an absolutist statement. The poll's real (unasked) question is 'Is Bush a lock for re-election?', and I think almost anyone would consider that way too strong a statement at this point.
[sarcasm]Thanks for your balance, CNN. [/sarcasm]
Not with a 9 iron and a head start. Oh wait, that's if he were a Kennedy. :)