What are Hillary's lines of attack, though?
1) She's ready, he's not.
2) He'll cut your entitlements.
3) He won't protect abortion rights.
4) Mandates mandates mandates mandates mandates.
5) He'll be too soft on Iran, Cuba, bad foreigners in general.
(1) would be too vague, since she can't use actual accomplishments to draw a distinction. (2) and (3) aren't really true, but she could hammer away at a couple of factoids and hope it sticks. (4) proves that an argument will balloon to the same size no matter how small the difference of opinion, as if filling a vacuum. She's too smart for (5). Now is not the time to attack from the right on foreign policy in a Democratic primary.
My guess is that she'll say "I'm a fighter" and "I/We fought for..." a lot, and try to paint Obama's feel-good rhetoric as proof that he'll appoint Grover Norquist as Secretary of Labor in the name of comity, or something.