(CNN) - Republican and Democratic gubernatorial nomination battles are in the spotlight Tuesday in Oklahoma as the state holds primaries.
Two-term Rep. Mary Fallin is considered the front-runner in the fight for the GOP nomination. The most recent survey indicates the conservative congresswoman holds a large lead over state Sen. Randy Brogdon, businessman and rancher Robert Hubbard, and retired businessman Roger Jackson. Last week Fallin was endorsed by Gov. Jan Brewer of Arizona, who has jumped in notoriety thanks to signing a controversial and tough immigration measure into law earlier this year.
With Fallin running for governor, seven Republicans and two Democrats are making bids for her House seat.
In the Democratic gubernatorial battle, the Tulsa World Oklahoma Poll conducted by SoonerPoll.com indicates that Oklahoma Attorney General Drew Edmondson leads Lt. Gov. Jari Askins.
The primary winners will face off in the general election in November, with the gubernatorial winner succeeding Democratic Gov. Brad Henry, who is prevented by term limits for running for re-election for a third term.
Both the Rothenberg Political Report and the Cook Political Report, two of the top non-partisan political handicappers, say the Republicans are favored to pick up the governor's seat in a state that Sen. John McCain won by 32 points over Sen. Barack Obama in the 2008 presidential election.
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- CNN Congressional Producer Deirdre Walsh contributed to this report