Mathew Greene, a self-proclaimed member of the Proud Boys, pleaded guilty on Wednesday to conspiracy and obstruction for his role in the deadly Jan. 6 Capitol riot. Why it matters: The 34-year-old is the first known member of the far-right group to plead guilty in federal court in connection to the riot. Several others affiliated with the Proud Boys have been charged. "The plea is significant because Matthew Greene ... admitted coordinating with other members of the extremist group at the front of the Capitol mob, although there is no evidence he actually entered the building," the Washington Post writes...