Of note is that many are from the Larouche Youth Movement.
Via The Weekly Standard:
About fifty protestors joined together outside of the Democratic National Committee on South Capitol Street this afternoon to protest the party’s debate rules.
Representatives from the Martin O’Malley campaign and their volunteers made up the biggest contingent. Between 6 and 10 fans of Democratic candidate Bernie Sanders attended, as did a few Lyndon LaRouche PAC supporters. (Lincoln Chafee, Jim Webb, and Hillary Clinton did not appear to have any supporters in attendance.)
Protesters were there to complain about the DNC’s lack of debates this presidential cycle: Six, down from 26 in 2008. On top of that, should candidates like Sanders, O’Malley, Webb, or Chafee participate in an outside debate, the DNC could exclude them. Protesters allege this is all an effort to protect Clinton.