A former labor union boss who drew national headlines in his race last year as an independent candidate challenging Nebraska Republican U.S. Sen. Deb Fischer is again throwing his hat into the political ring — this time to challenge Nebraska's junior senator,

Former independent US Senate candidate Dan Osborn announced Tuesday that he will make another run for office next year, this time against GOP Sen. Pete Ricketts of Nebraska.

Independent populist Dan Osborn, whose insurgent Senate campaign seriously threatened one of Nebraska’s Republicans from securing a third term last year, is now taking on GOP Sen. Pete Ricketts — one of the wealthiest members of Congress.