[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/05/28/art.blcinton.0428y.gi.jpg caption =" Former President Bill Clinton will campaign in New York on Friday with Rep. Mike McMahon."](CNN) - A Democratic congressman from New York City who could face a competitive road to re-election this autumn is calling in a big gun.
And that big gun is former President Bill Clinton, who teams up at a campaign rally Friday morning with freshman Rep. Mike McMahon of New York's 13th congressional district.
The district covers Staten Island and a small portion of southwest Brooklyn, and is considered the most conservative in New York City. John McCain won the district by two points in the 2008 presidential election and George W. Bush carried it by 10 points in his 2004 re-election.