PHILADELPHIA (AP) — Sen. Bernie Sanders urged supporters to rally behind Hillary Clinton at the Democratic convention, but ardent followers who marched for hours in punishing heat Monday and planned to do so again seemed intent on keeping his upstart campaign alive. While Sanders encouraged his supporters to fall in line with Clinton, dozens were cited after they climbed barricades outside the convention, and many expressed disgust with party leaders after leaked emails suggested they had favored Clinton over the Vermont senator during the primary race. Another series of protests and rallies was planned for Tuesday, the anger reflecting the widening rift inside the Democratic Party and the convention hall itself between Sanders' supporters and Clinton's. Fifty-five people were issued citations as they tried to breach police barricades at the edge of the security zone surrounding the convention, police said.