Former labor union leader and independent candidate Dan Osborn has announced his bid for a Nebraska U.S. Senate seat, challenging Republican Sen. Pete Ricketts.

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.

Dan Osborn, an industrial mechanic who lost a Senate bid against Sen. Deb Fischer (R-Neb.) by single digits last year, is launching another bid for the upper chamber — this time for Sen. Pete