Allegheny County Sheriff Deputy Kevin Kraus appeared to have won his primary, beating out fellow hopeful Dom Costa for county sheriff. Early Wednesday morning, Kraus was leading by nearly 3,700 votes, with 99 percent of precincts reporting. The two Democrats were vying to replace retiring Sheriff William Mullen, who has served in the office since 2007. Kraus joined a crowd of supporters in Ross Township Tuesday evening, but left the event early. A campaign staffer said Kraus was anxiously awaiting the final vote count after periods where the two candidates were separated by 2,000 votes. He served as a Pittsburgh police officer for decades before moving to the sheriff’s office, where he was later appointed chief deputy in 2014. Dom Costa was a police officer in East McKeesport before becoming a Pittsburgh police commander and the city’s chief of police in 2006.