MSNBC and Fox project that Hillary wins Texas, giving her victories in both her crucial firewall states, and handing her three out of four victories tonight, ensuring that this campaign will continue, possibly all the way until the convention.

She leads Obama 51%-48% in Texas, with 74% reporting. It's a much tighter margin than in Ohio, as expected. But the win allows Hillary to claim that she's won all the big states, an argument that will make it easier for her to argue that she has a fair claim to continuing in the contest, despite her big deficit in pledged delegates.

The Clinton campaign will also seize on the victory in all the big states to argue that despite Obama's big pledged delegate lead, there's no clear victor here, and hence that neither candidate can win without super-delegates -- potentially setting the stage for a bruising intraparty battle with no clear resolution or end.