Brandon Wolf lost two close friends in gay nightclub massacre
Survivors, victims' families remain vocal gun control advocates
Gunman killed 49 people inside gay nightclub in 2016
Activists call for channeling grief into action
Rubio criticized over gun control, LGBT rights
Christine Leinonen criticizes Marco Rubio over gun control
Victims' families, friends struggle to cope with tragedy
Orlando resilient, defiant after Pulse massacre
Mother of Pulse nightclub massacre among attendees
Florida Republican announced re-election bid after nightclub massacre
