A woman pushes her child past a "Jim Kenney for Mayor of Philadelphia" sign on primary election day in Philadelphia, Pennsylvania on May 19, 2015. Campaign finance watchdog groups fear heavy spending by ultra-rich Americans will warp the election - already expected to be the most money-soaked in history - and prop up candidates who don't represent the will of the majority. Photo taken May 19, 2015. REUTERS/Mark Makela