Edwards' support in SC

Edwards pounded Obama in South Carolina among whites, 40-24. Edwards says he's in it for the long haul. He wants to be the kingmaker at the convention.

But if this doesn't happen, and Edwards drops out, do his voters go to Obama or to Hillary? The simple assumption that he's picking up the "anti-Hillary vote," a majority of which would then go with Obama, doesn't necessarily hold water.

Edwards' voters were a reverse mirror-image of Obama's in South Carolina. Edwards' voters were overwhelmingly white, Obama's black. His voters were old, Obama's young. Edwards' support went up with income, Obama's down. Obama did best, and Edwards worst, with single women.

These are Hillary's voters. Obama needs Edwards, in other words. If Edwards can continue to hive off Clinton voters, Obama can end up top dog.