FILE - In this Sept. 30, 2012 file photo, President Barack Obama speaks in Las Vegas. President Barack Obama's campaign is stepping up criticism of rival Mitt Romney's past investments in China. In a new television ad, the campaign accuses the Republican nominee of investing in a company that maximized profits by paying Chinese workers “next to nothing” to manufacture appliances. The ad aims to discredit Romney's assertion that he would take on China's trade advantage over the U.S. (AP Photo/David Becker, File)

Associated Press
FILE - In this Sept. 30, 2012 file photo, President Barack Obama speaks in Las Vegas. President Barack Obama's campaign is stepping up criticism of rival Mitt Romney's past investments in China.  In a new television ad, the campaign accuses the Republican nominee of investing in a company that maximized profits by paying Chinese workers “next to nothing” to manufacture appliances. The ad aims to discredit Romney's assertion that he would take on China's trade advantage over the U.S.  (AP Photo/David Becker, File)
FILE - In this Sept. 30, 2012 file photo, President Barack Obama speaks in Las Vegas. President Barack Obama's campaign is stepping up criticism of rival Mitt Romney's past investments in China. In a new television ad, the campaign accuses the Republican nominee of investing in a company that maximized profits by paying Chinese workers “next to nothing” to manufacture appliances. The ad aims to discredit Romney's assertion that he would take on China's trade advantage over the U.S. (AP Photo/David Becker, File)
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