Once the fun begins, you can hop into Party Mode from your mobile, and photos you shoot during the event will appear beside the invite -- friends can add pics to the page as well, which you can later download.
Mr Specter's party-hop will dramatically change the political terrain that Mr Obama faces in his second 100 days, all but guaranteeing the Democrats control of the 60 seats in the 100-seat Senate that allows them to pass legislation without the threat of a filibuster.