The retirement of Sen. Mike Johanns (R) left an open seat in Nebraska. Because the district was a safe Republican seat, much of the campaigning happened in the primary election. The two frontrunners, Ben Sasse and Shane Osborn, both received early endorsements from conservative organizations. Sasse hit the ground running with record breaking fundraising early in the cycle. Sasse defeated Osborn in the primary, and Democratic candidate Dave Domina in the general election on November 4, 2014.