Gov. Kate Brown, a Democrat, is running for her first full term; she assumed office and then won a special election after the resignation of John Kitzhaber in February 2015. Ten candidates made the ballot for the GOP nomination, including state Rep. Knute Buehler, who lost to Brown in the 2012 secretary of state election.
Pete Buttigieg and other Democrats have been attacking each other more sharply, marking a new phase in the campaign as the fourth debate approaches. The attacks are playing out as several candidates face limited time to break into the top tier.