U.S. Democratic presidential candidate Senator Barack Obama (D-IL) (R) shakes hands with a worker at a General Motors plant in Janesville, Wisconsin in this file image from February 13, 2008. General Motors Corp said on October 13, 2008 it would close its oldest and largest plant, which has built vehicles since 1919, by the end of the year because of the shrinking market for the full-size SUVs it makes there. GM had said it would close the Janesville, Wisconsin, assembly plant by 2010, but spokesman Chris Lee said the sharp decline in SUV sales through September forced it to act sooner. It will close on Dec. 23. REUTERS/John Gress/Files (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)