The Hill News

A Democratic-leaning super-PAC is aiding the Obama campaign's push to force GOP presidential front-runner Mitt Romney to release more of his past tax returns, just as the president is calling on his likely general-election rival to be “transparent” with his finances.

The outside spending group, American Bridge 21st Century, released a video Sunday titled, "What's Mitt Hiding?" in conjunction with a website urging voters to sign a petition demanding to see the former Massachusetts governor's past returns. 

"Why should we believe that Mitt's got nothing to hide? Between his Swiss bank accounts and off-shore investment funds in the Caymans, don't you think there's probably more going on than meets the eye?," says the text posted along with the YouTube video. 

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