While Hillary's not likely to gain much ground on Obama on the new-ideas category -- most of hers so far have been transparently grade-schoolish -- she could lose ownership of the strength and experience category. Obama just needs to understand and capitalize on the fact that Hillary's perceived attributes of strength and experience are a mirage.
Apart from misappropriating credit for her husband's presidency, she has very little qualifying experience. Obama doesn't, either -- but that isn't the strength he's basing his campaign on. Hillary claims she was co-president, but Bill gave her just enough of an illusion of power to pacify her, if you get my drift. She held no official position and had no accountability, even to the grand jury.
Similarly, the idea that she is strong is largely a media creation. If she were strong, she wouldn't need to rely so heavily on her husband to vouch and stump for her. She's trapped in a Catch 22. She needs Bill to energize her campaign, but in enlisting his aid, she exposes herself as his dependent, unpresidential surrogate.
More significantly, Hillary has unusually high negatives. Instead of countering this by running a positive, idea-driven campaign, she prefers, by her own giddy admission ("Now the fun part starts"), to attack her rivals.
But when she's having this "fun," she's more likely to be off script and to reveal the real Hillary -- the one that so many don't like.
So, if Obama is smart, he'll take her out of her comfort zone and encourage her to get off-script more often by fearlessly attacking her highly vulnerable record and positions and inviting her to abandon her pseudo-poised, rehearsed presidential mode.
The more she shows that infamously petty and vindictive side, where she curses Secret Service agents in her charge, the more she unveils the traits that caused her to remark that she wanted "to start seeing (the woman who cleans the restroom in the building she worked in) as a human being," the more negative and less presidential "Saint Hillary" will appear.
Her increased negativity could also resurrect the profound negatives associated with the Clinton years, which many people have relegated to the recesses of their memories through the natural human tendency to remember mostly the good things.
So, go for it, Barack. You're still a long shot, but what do you have to lose?