In a new campaign ad, Mitt Romney doesn't mince words in boasting about the Massachusetts economy when he was governor. The ad -- which combines stirring music, footage of welders and forklift drivers and images of Romney gladhandling with factory employees -- was released June 8, 2012. "Romney," the ad says, "reduced unemployment to just 4.7 percent." We checked Bureau of Labor Statistics data and found that the statistic was correct. The low point for the seasonally adjusted unemployment rate during Romney’s tenure was 4.7 percent. (It happened during Romney’s final full month in office, December ...