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Rich Denesha, 30, of Norwich, said he has heard Mr. Blumenthal is an effective attorney general who has taken on special interests. But after hearing about the candidate’s misstatements about Vietnam — words he later apologized for — and his comments about never taking PAC money, Mr. Denesha said he thinks Mr. Blumenthal is now playing politics.

“If he’s going to do this to get elected, why am I going to be led to believe he’s going to do anything different once he’s elected?” said Mr. Denesha, a registered Republican.

McMahon campaign spokesman Ed Patru says Mr. Blumenthal has a “troubling habit of being untruthful,” an image Mrs. McMahon’s campaign has been trying systematically to paint of the Democrat.

In response, Ms. Downes said: “People know Linda McMahon’s not qualified to be their U.S. senator, and all her money and phony attacks can’t change the truth that Dick Blumenthal will always stand up to the special interests and fight for the people of Connecticut.”

Ms. Downes said Mr. Blumenthal is adhering to self-imposed limits on accepting political contributions.

For example, she said, he is not accepting money from people who work in the attorney general’s office or lawyers it hires as outside counsel. He also is taking no donations from individuals connected to companies under investigation by his office or in litigation with his office.

Among the PAC contributions to his Senate race, there are groups Mr. Blumenthal’s office has dealt with as recently as 2009 and 2010. For example, federal records show his campaign received $10,000 from the PAC organized by the International Association of Machinists and Aerospace Workers. As recently as Thursday, Mr. Blumenthal was urging jet-engine manufacturer Pratt & Whitney to reconsider its plans to lay off 129 union workers at its Cheshire plant.

In January, his office argued in federal court for an injunction blocking the transfer of another 1,000 jobs out of state.