Democrats Hillary Rodham Clinton and Barack Obama waged a last-ditch push for votes in Indiana and North Carolina on Monday even as both vowed to keep campaigning through the month regardless of today's primary results.

Her TV ads promoted her plan for a summer-long gas-tax holiday and contended she was the candidate who "gets it." He said the plan was just another Washington stunt.

Mr. Obama hurried back and forth between the two states, pleading for support in the two biggest prizes of the remaining primaries. "I want your vote. I want it badly," he said on a factory floor in Durham, N.C., one of many stops aimed at winning over white working class voters, a group he's struggled to attract.

Mrs. Clinton, also campaigning in North Carolina, sought blue-collar votes, too, talking about the hard times the country faces.

"It's time to quit wringing our hands and start rolling up our sleeves," she said.

One prominent and neutral Democrat, former Rep. Harold Ford of Tennessee, said Monday that Mrs. Clinton appeared to be gaining in both states, thanks to her detailed promise to help voters worried about pocketbook issues.

But Obama strategist David Axelrod said, "Whatever happens is not going to markedly change the delegate situation."

Mrs. Clinton's main hope for winning the nomination is to persuade most of the 200-plus superdelegates still undecided to disregard Mr. Obama's lead in the delegate chase and support her instead. The Clinton campaign also hopes to get a boost by getting delegates from Michigan and Florida seated.

The Associated Press and McClatchy Newspapers contributed to this report.