OKLAHOMA CITY (AP) — Oklahoma Republicans seized control of every statewide elected office in the 2010 midterm election, and they've maintained their dominance ever since.

But in a state Republicans like to boast is the "reddest of the red," 72-year-old Democrat Drew Edmondson is threatening to break the GOP stranglehold and win back the governor's mansion after eight years under Republican Gov. Mary Fallin, who has reached her term limit.

Polls have consistently shown Republican mortgage company owner Kevin Stitt, a 46-year-old political newcomer who casts himself in the mold of a businessman...