(CNN) –- MoveOn.org named a new executive director Tuesday to head up the daily operations of one of the largest liberal political action committees in the nation.
Former National Organizing Director Justin Ruben was appointed to the post, held until recently by Eli Pariser. Ruben, a long-time political organizer, aided in the establishment of the group’s field organizing program, and headed the 2006 “Call for Change” campaign that facilitated in the election of a Democratic congressional majority, and served as a supervisor for two years in MoveOn's issue campaigns.
"I am honored to take the helm of this organization at this critical moment," said Ruben. "Our five million members stand ready to fight for President Obama's progressive agenda of creating jobs, developing a new green economy, providing health care for all and ending the war in Iraq."
Eli Pariser, the committee’s former executive director, will transition to president of the board.
MoveOn.org supported Barack Obama’s White House bid, a first-time endorsement move for the PAC. Since the organization’s inception, the 527 turned 501(c)(4) organization has spent millions of dollars on ad campaigns and grassroots organizing.