At a National Review summit, he gave an impassioned defense of the controversial issue.
Mario Trujillo 04/30/15 04:53 PM EDT
The lawmakers say the FCC should act, even if their disclosure bill fails.
"We will have that debate," vowed Sanders, who opposed the war.
"I agree with Bernie. Focus must be on helping America's middle class," Hillary tweeted.
Julian Hattem 04/30/15 01:54 PM EDT
Nancy Pelosi and others are pushing for new campaign finance regulations.
“I've never run a negative ad in my life,” he said at a Thursday afternoon press conference.
Sanders formally entered the presidential race on Thursday.
"I’m home on weekends,” the GOP's 2012 vice presidential nominee said.
The DSCC is targeting nine GOP senators for past opposition.
Peter Schroeder 04/30/15 10:13 AM EDT
MoveOn welcomed Sanders, while calling for Warren to run, too.