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,

Independent Dan Osborn announced another bid to represent Nebraska in the Senate on Tuesday, challenging GOP Sen. Pete Ricketts after his loss in an unexpectedly competitive race against a Republican incumbent last year.

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.