Social media giant apologizes for ‘error’
2020 hopeful said to bring in $75,000 at event
500,000 expected for protest against gun violence
Gunman killed 26 people in Texas church on Sunday
'We lost a hero, a fearless warrior and I lost a friend'
Gutiérrez, Harmon, Keisling among award recipients
Some see parallels to Tea Party obstruction, others fear 'protest fatigue'
MSNBC reporter Andrea Mitchell gave the keynote address
D.C. activist John Becker launched petition with transgender Minnesota man who nearly died from infection