Biden attends Labor Day parade in Pittsburgh (15 images)

Vice President Joe Biden shakes hands with supporters along the route of the Allegheny County Labor Day Parade in Pittsburgh on September 7, 2015. Photo by Archie Carpenter/UPI

Vice President Joe Biden addresses union members before the start of the Allegheny County Labor Day Parade in Pittsburgh on September 7, 2015. Photo by Archie Carpenter/UPI

Vice President Joe Biden greets a woman watching the Allegheny County Labor Day Parade in Pittsburgh on September 7, 2015. Photo by Archie Carpenter/UPI

Vice President Joe Biden walks the parade route at the Allegheny County Labor Day Parade and pauses to greet supporters in Pittsburgh on September 7, 2015. Photo by Archie Carpenter/UPI