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 SassePelosi: McConnell 'unwittingly' helped Dems win Trump deal Trump: Texas churches should get FEMA funding for hurricane relief Cruz walks political tightrope on debt-ceiling deal MORE.

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All three groups aligned behind state Treasurer Don Stenberg, who lost in the primary to now-Sen. Deb FischerDebra (Deb) Strobel FischerSenate approves Trump's debt deal with Democrats Trump administration turns to rural communities for input on infrastructure bill Senators eye ticket fee to overhaul airports 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.