President Barack Obama continues to go after Mitt Romney for investing in companies that sent jobs overseas. A recent Obama ad combines the outsourcing charge with an attack on Romney’s claim that he would take a tougher line than the president on trade with China. It features grainy photos of Chinese factory workers in assembly plants. An announcer says: "These appliances could have been made here in America. But a company called Global-Tech maximized profits by paying its workers next to nothing under sweatshop ...