D.C. Mayor Vincent C. Gray carries throws for people in the crowd as he begins his walk in the 46th Annual Palisades Parade and Picnic in Washington on Wednesday, July 4, 2012. (Rod Lamkey Jr./The Washington Times)

D.C. Mayor Vincent C. Gray carries throws for people in the crowd as he begins his walk in the 46th Annual Palisades Parade and Picnic in Washington on Wednesday, July 4, 2012. (Rod Lamkey Jr./The Washington Times)