Numbers to watch today

While Hillary Clinton's campaign is on the surface moving ahead, two numbers today could determine how long she can stay in the Democratic nomination race.

One is how many superdelegates publicly declare their allegiance to Barack Obama.

His resounding victory in North Carolina and nail-biter loss in Indiana suggested he has overcome the roughest patch of his campaign, and superdelegates could be more free to endorse. So far, the endorsements has come in twos or threes a day. If they emerge in double figures, that would significantly increase the pressure on Clinton to withdraw. There are about 270 undeclared superdelegates, the party officials and elected leaders who will likely determine the nominee.

The other figure is how much money Clinton raises online.

She all but begged for money in her primary night speech. She did the same after her much bigger win in Pennsylvania and brought in $10 million within 24 hours. If she doesn't get close to that number, that would suggest her donor support is drying up. Her campaign acknowledged today that she loaned herself another $6.4 million over the last month.

Her senior aides told reporters in a conference call this morning that her win in Indiana, however narrow, allows her to go forward. And while Obama is taking the day off the campaign trail, she has an event scheduled in Shepherdstown, West Va., site of the next primary on Tuesday. She will attend a “Generations of Women” fundraiser in Washington, D.C.