“My friendships are apolitical,” the New Jersey rocker said through his spokesman.
Sanders supports a constitutional amendment to undo the 2010 Citizens United decision.
The 2016 hopeful shares his impressions of Mr. Burns and Ned Flanders.
The New Jersey governor made the announcement with a speech at his old high school.
Chelsea spoke for 10 minutes, followed by a Q-and-A and photo session.
Peter Sullivan 06/30/15 10:26 AM EDT
He said the 60-vote requirement "slows bad liberal, radical ideas."
Sanders has surged in polls in New Hampshire.
"He stopped serving as an umpire," the 2016 GOP candidate said.
Bundy made headlines last year and became the face of a land rights standoff in Nevada.
Bush's release pressures Hillary Clinton to release her latest financial figures.