But in addition to emphasizing Warren’s background as an advocate for consumers and the middle class, it pushes back on a recent line of attack from Brown and Republicans: that if Warren wants the wealthy to pay more in taxes, she should put her money where her mouth is.

Brown’s campaign has charged Warren with hypocrisy for supporting the Buffett Rule but declining in Massachusetts to voluntarily pay a higher rate. Although the income tax rate in the Bay State is 5.3 percent, taxpayers can choose to pay 5.85 percent if they want to contribute more than they owe.

“This is the sort of hypocrisy and double-speak voters are sick and tired of hearing from politicians, especially those who can't keep their hands out of others' pocketbooks,” Brown’s campaign manager, Jim Barnett, said Friday in a statement.

But another Massachusetts Republican running for office has dismissed the idea of politicians paying more to the government than they owe — Mitt Romney, who said when he released his tax returns in January that he paid everything how owed “and not a dollar more.”

"I don't think you want someone as the candidate for president who pays more taxes than he owes,” said Romney, who shares many of the same top strategists as Brown.

Warren and Brown have also been quibbling about who should release their tax returns and for how many years. Brown has suggested he might release five or six years of returns, while Warren said she would consider releasing more than the two years she has already released if Brown also makes his records public.

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