File photo of US Democratic presidential nominee Senator Obama speaking to Joe the Plumber in Ohio

 
File photo of US Democratic presidential nominee Senator Obama speaking to Joe the Plumber in Ohio
US Democratic presidential nominee Senator Barack Obama (D-IL) (L) speaks to Joe Wurzelbacher as he canvasses a neighbourhood in Holland, Ohio in this October 12, 2008 file photo. Obama and John McCain may have turned him into the most famous small-business owner in America, but Joe the Plumber isn't about to return the favor with an endorsement. Wurzelbacher came to prominence last week when he asked Obama about his tax plan during a campaign stop, which led to an appearance on a Fox News talk show and an invitation to a McCain rally. Picture taken October 12, 2008. REUTERS/Jim Young/Files (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)