FreedomWorks has split with other national conservative groups in the Nebraska Senate race, announcing its endorsement Monday for former state Treasurer Shane Osborn.

The Club for Growth and the Senate Conservatives Fund, two other prominent groups that also play in primaries, have both endorsed Midland University President Ben SasseBenjamin (Ben) Eric SasseThe Hill's 12:30 Report Overnight Defense: Trump unveils new sanctions against Russia | Key Republicans back VA chief amid controversy | Trump gives boost to military 'space force' McCain, Sasse call for coordinated NATO response to poisoning of ex-Russian spy MORE.

All three groups aligned behind state Treasurer Don Stenberg, who lost in the primary to now-Sen. Deb FischerDebra (Deb) Strobel FischerBill to bolster gun background checks gains enough support to break filibuster Senate Republicans call on Trump to preserve NAFTA US trade deficit rises on record imports from China MORE (R).

Nebraska is a reliably red state, and the GOP primary is expected to name the ultimate successor to retiring Sen. Mike Johanns (R), so a GOP split in the primary isn't likely to jeopardize the party's chances at keeping the seat.

Omaha banker Sid Dinsdale and Omaha lawyer Bart McLeay are also running in the primary.