It's not with silly attacks on Obama, like the 'red phone' ad she's currently airing. (Obama's response to that was spot on, by the way.) And it may be too late for her to make any convincing argument at all at this point, but here is what I see as her main advantage over Obama, and how she could have capitalized on it.
She could say something like: "Obama talks a lot about wanting to restore bipartisanship in Washington DC. That's great, but what I want to do is get some good legislation passed--whether the Republicans like it or not. The Democratic party has been pushed around by the Republicans for a long time. When I'm president, the Democrats are going to do some pushing back! Like Obama, I'll extend my hand across the aisle to work with the opposition. But we're likely going to have Democratic majorities in both houses of Congress in 2009, and if the Republicans aren't willing to work with us, we'll work without them. I'm not going to bend over backwards to work with them, just so I can say I've 'changed how Washington works.' As you know, my family has been on the receiving end of some of the worst the Republicans can dish out. We survived. In 2009, if they are still determined to pander to the right-wing extremists of their party, we--the Democratic majorities in Congress and me in the White House--will show them (and Senator Obama) that Washington DC can work just fine, as long as there is the will and discipline in Congress, and a strong, determined leader in the White House."
[updated to spell Hillary's name correctly in the title, and a couple other minor edits.]
She could say something like: "Obama talks a lot about wanting to restore bipartisanship in Washington DC. That's great, but what I want to do is get some good legislation passed--whether the Republicans like it or not. The Democratic party has been pushed around by the Republicans for a long time. When I'm president, the Democrats are going to do some pushing back! Like Obama, I'll extend my hand across the aisle to work with the opposition. But we're likely going to have Democratic majorities in both houses of Congress in 2009, and if the Republicans aren't willing to work with us, we'll work without them. I'm not going to bend over backwards to work with them, just so I can say I've 'changed how Washington works.' As you know, my family has been on the receiving end of some of the worst the Republicans can dish out. We survived. In 2009, if they are still determined to pander to the right-wing extremists of their party, we--the Democratic majorities in Congress and me in the White House--will show them (and Senator Obama) that Washington DC can work just fine, as long as there is the will and discipline in Congress, and a strong, determined leader in the White House."
[updated to spell Hillary's name correctly in the title, and a couple other minor edits.]