Occupy movement supporters march in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina. Labor groups from across the state participated in the Labor Day event on the eve of the Democratic National Convention. (Photo by Tom Pennington/Getty Images)
- [Tom Pennington/AFP/Getty Images]

Mississippi deligate Kelly Jacobs participates in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina. Labor groups from across the state participated in the Labor Day event on the eve of the Democratic National Convention. (Photo by Tom Pennington/Getty Images)
- [Tom Pennington/AFP/Getty Images]

Members of the National Mail Handlers Union Local 305 march in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina. Labor groups from across the state participated in the Labor Day event on the eve of the Democratic National Convention. (Photo by Tom Pennington/Getty Images)
- [Tom Pennington/AFP/Getty Images]

Mississippi deligate Kelly Jacobs sports a patriotic hat as she participates in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina.
- [Tom Pennington/AFP/Getty Images]

Retired auto worker, Roger Heavner (L), participates in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina.
- [Tom Pennington/AFP/Getty Images]

US President Barack Obama speaks during a Labor Day campaign event September 3, 2012 at Scott High School in Toledo, Ohio.
- [Mandel Ngan/AFP/Getty Images]

Union supporters march in the "Charlotte Labor Day Parade" on September 3, 2012 in Charlotte, North Carolina.
- [Tom Pennington/AFP/Getty Images]

Peter Williams, with United Auto Workers Local 5283, holds an American flag while waiting for the start of the "Charlotte Labor Day Parade."
- [Tom Pennington/AFP/Getty Images]