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Mrs. Clinton’s supporters made the rounds of the region yesterday as well.

“I think if the test is who’s got the best ideas, who’s got the right policies, who’s got the best record of actually making changes in other people’s lives, it’s not a close call,” former President Bill Clinton said while campaigning for his wife in Fredericksburg yesterday.

Mrs. Clinton touted her “green jobs” plan to fight climate change and boost the economy while touring a General Motors factory that makes hybrid car transmissions in White Marsh, Md.

Mr. Obama also played up his environmental plan when rallying the college students yesterday.

“We are going to cap greenhouse gases and we are going to charge polluters,” he said, and invest the money in clean energy projects. Under his plan, young people would be trained to insulate homes for energy efficiency and to “change light bulbs,” he said.

As the two Democrats remain nearly tied in the race to win enough delegates to receive the nomination, a whopping Obama victory would push his numbers up further and attract crucial superdelegates.

“This will be a better month for Senator Obama than it will be for us,” predicted Clinton spokesman Howard Wolfson. “We believe next month will be a better month for us.”

The Associated Press has calculated Mr. Obama has 931 pledged delegates to Mrs. Clinton’s 882, before he won at least 15 of the 24 delegates available in Sunday’s Maine caucus.

But if superdelegates who have declared their support, which is nonbinding, are factored into the count, Mrs. Clinton led Mr. Obama 1,125 to 1,087 before the Maine results are added.

Mr. Obama began running television ads in Texas and Ohio yesterday, but Mrs. Clinton currently leads in polls of voters in those big states.

The Illinois senator, clearly in a good mood as national polls showed him tied with or beating Mrs. Clinton, teased the top-ranked women’s basketball team at the University of Maryland and said they should play some pickup rounds.

“I’ve still got game,” he said.

He later pushed back against Mrs. Clinton’s claim she is battle-tested enough to stand up to Republicans.

“I may be skinny, but I’m tough, too,” he said.

Mr. Obama outlined his record as a state legislator and community organizers in Illinois, and added if voters choose him, “you will elect a president who has taught the Constitution, and believes the Constitution and will obey the Constitution.”

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