Congress is heading back to its roots in Philadelphia for a historic offsite gathering on July 2 to celebrate the 250th anniversary of the signing of the Declaration of Independence, according to the U.S. representative organizing the event and a local official with knowledge of its planning. U.S. Rep. Brendan Boyle, a Democrat whose district includes Philadelphia, is spearheading the gathering. “Exactly two years ago I launched this effort to bring Members of Congress, both Democrats and