“Prove it by releasing your tax returns,” she said.
It's that simple
http://thecaucus.blogs.nytimes.com/2012/07/12/romneys-bain-tenure-seized-on-again-by-obama-camp/
<snip>
President Obamas campaign on Thursday seized on a new report on Mitt Romneys truthfulness about his tenure at Bain Capital even as the Republican candidate began airing a television commercial calling the president a liar.
Mr. Romneys new advertisement flatly says that the president doesnt tell the truth, accusing Mr. Obama of making ridiculous claims about Mr. Romneys record and of citing discredited information about his time at the private equity firm he founded.
But a Boston Globe article published on Thursday provided a new opportunity for the Democratic campaign to blunt any momentum the Republican might make.
The paper reported on federal securities documents showing that Mr. Romney had served as the owner, board chairman, chief executive and president of Bain Capital for several years after he had claimed publicly to have left the firm.
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GObama!