The former lawmaker is challenging Sen. Ron Johnson.
The returns show he paid an average tax rate of 36 percent over the years.
"When I look for solutions, I don't start in Washington," the New Hampshire Republican says.
“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.