Omaha businessman Pete Ricketts won the Republican nomination for governor of Nebraska in Tuesday's primary, squeaking by state Attorney General Jon Bruning.

Republican gubernatorial candidate Pete Ricketts speaks in Lincoln, Neb., Tuesday, May 13, 2014, after winning his party's primary election. (AP Photo)

With all precincts reporting, Ricketts outpaced Bruning by about 2,200 votes out of roughly 219,000 ballots cast. Four other candidates sought the GOP nomination. Bruning conceded the race to Ricketts late Tuesday.

Ricketts is the son of billionaire TD Ameritrade founder Joe Ricketts, a prominent conservative donor and power broker. The younger Ricketts attracted the support of a slate of potential 2016 Republican presidential candidates during the campaign, including Wisconsin Gov. Scott Walker, Indiana Gov. Mike Pence, Rep. Paul Ryan (Wis.) and Sen. Ted Cruz (Tex.).

Pete Ricketts will begin the general election as a substantial favorite over Democratic nominee Chuck Hassebrook, given the state's clear conservative tilt.