By KEN THOMAS WASHINGTON — President Barack Obama is challenging Mitt Romney’s promises to crack down on China’s trading practices, saying in an ad released Saturday that the Republican candidate profited by allowing China to strip away U.S. jobs. [youtube]o0tZK_qHHCc[/youtube] Obama’s ad turns again to a recent Washington Post report that several businesses backed by… Continue reading New Obama Ad Slams Romney on China Outsourcing (Video)