In Oklahoma and Tulsa counties, Sanders held only a slim lead in the latter and trailed badly in the former. But Sanders did well outside of the state’s two largest counties.

Sanders won Cleveland County, with the third-largest number of registered voters and the home of the University of Oklahoma, by more than 20 points. He carried Payne County, where Oklahoma State University is located, by 18 points.

In the 2nd Congressional District, where a third of the state’s registered Democrats live, Democrats mostly voted for Sanders or stayed home. Democratic turnout in the district appeared to be around 25 percent, compared to more than 50 percent in Cleveland County, nearly 50 percent in Tulsa County and 45 percent in Oklahoma County.

Luke Harris, a volunteer organizer for Sanders, said Sanders’ win in Oklahoma was a grassroots effort.

“We hit 10,000 doors statewide, and though that was mainly in Tulsa and Oklahoma City, we also had people all over the state,” Harris said.

He said he and other supporters are hoping their campaign for Sanders reforms the Democratic Party in Oklahoma.

“What we do after this is what matters,” Harris said. “We’re all working on this together.”