North Carolina and Indiana are looking like the last chance for the Democratic candidates to take in a big chunk of pledged delegates.

Altogether, 187 delegates are at stake in the two states. After today, there are just 217 pledged delegates up for grabs in the six remaining contests.

North Carolina and Indiana can't mathematically settle the nomination for either Barack Obama or Hillary Rodham Clinton. A candidate needs 2,025 delegates to win, and -- as of yesterday -- Obama had 1,745.5 to Clinton's 1,608.

The key to the nomination is held by superdelegates, of which about 220 are still undecided.

Clinton's main hope is to persuade most of the still-neutral superdelegates to disregard his lead in the delegate chase and support her instead. She is also hoping to get delegates from Michigan and Florida seated at this summer's convention.