Omaha union leader Dan Osborn has drawn millions of dollars in outside support and caught the GOP’s attention in the solidly red state.

Allegations flew Monday in Nebraska’s most competitive U.S. Senate race, with one campaign threatening legal action over campaign advertising and a report about talk of “Hitler Youth.” Nebraska nonpartisan candidate Dan Osborn’s campaign sent a cease and desist letter to an outside group advertising in support of U.

Independent labor union leader Dan Osborn has raised a lot of money in recent months, and polls have tightened enough that the Cook Political Report has shifted their forecast for the race from “Solid Republican” to “Likely Republican.

The poll has independent Dan Osborn ahead of Republican Incumbent Deb Fischer by one point: 45 to 44 point. In the poll of 558 likely Nebraska voters 48 percent had a favorable opinion of each Osborn and Fischer. "This is the most competitive senate race in the country right now," Osborn told KETV. "And we can win this thing."

Heartland Resurgence is running nearly $480,000 in ads to slow Dan Osborn’s longshot independent campaign and protect Deb Fischer’s seat.

An independent candidate in Nebraska's Senate race has managed to make the election more competitive, with millions of outside money being poured into the state on his behalf.

Independent candidate from Nebraska for Senate, Dan Osborn, joins Morning Joe to discuss his campaign, which is causing Republicans in his state to scramble.