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McCain campaign spokesman Brian Rogers said the senator’s position on earmarks is well-known among supporters and critics alike. He said Mr. McCain would not shy away from making decisions on earmarks that might anger supporters.

“John McCain didn’t win ‘Mister Congeniality’ in the U.S. Senate by consistently opposing the earmarking process that’s corrupted our Congress and railing against wasteful spending, not only by the Democrats but by the Republicans,” he said.

“This is somebody who has taken on his own party, whereas Senator Obama has no record for cutting government spending.”

Two of the McCain bundlers, Reps. Eric Cantor of Virginia and Mark Steven Kirk of Illinois, support an earmark moratorium backed by Mr. McCain and his Democratic opponent.

But Leslie Paige, spokeswoman for Citizens Against Government Waste, said all of Mr. McCain’s congressional fundraisers should halt their earmark requests.

“If you’re supporting one of the biggest anti-earmark champions to walk into Congress, then it probably would behoove you to adopt that same philosophy,” she said.

A spokesman for Mr. Obama said no members of Congress are serving as fundraisers for the Democratic candidate’s campaign.

Still, earmarks have emerged as a big issue in the presidential race.

Republicans have attacked Mr. Obama for seeking nearly $1 billion in earmarks since taking office in 2005 and they are pressing his running mate, Sen. Joseph R. Biden Jr. of Delaware, to release his earmark requests amid scrutiny about the work of his lobbyist son, R. Hunter Biden.

The Obama campaign chided Democratic Sen. Hillary Rodham Clinton of New York for not releasing her earmark requests earlier this year, but it hasn’t yet released what projects Mr. Biden has requested since his election to the Senate in 1972.

Meanwhile, Democrats have tried to undercut Mr. McCain’s reformer image by pointing out that running mate, Alaska Gov. Sarah Palin, supported earmarks while she served as mayor of Wasilla, Alaska, and as governor.