The Obama campaign keeps the focus on McCain and the economy by going local, spotlighting the plight of workers who were fired after a Corning plant closed in Pennsylvania...How's this for a blast of ancient history: This Corning plant was actually also the subject of a mailer that Obama dropped during the campaign hitting Hillary for supporting normalizing trade relations with China.The initial mailer was somewhat misleading, wrongly implying that Corning itself had shipped the jobs overseas. But the current spot doesn't repeat those errors, instead saying (accurately) that some of the workers were hired to ship the materials to China. The ad is running in Pennsylvania and in other key states.