Potomac businessman David Blair on Tuesday filed a request for a recount in his Democratic primary race against incumbent Montgomery County Executive Marc Elrich. Elrich held a 35-vote lead when Montgomery County election workers certified results in the race Saturday afternoon after nearly a month of canvassing, tabulating and auditing ballots. Blair’s petition with the county is the latest development in the closely watched, well-funded and fierce rematch between Blair and Elrich. The two men previously went toe-to-toe in the 2018 primary. Elrich won that election by 77 votes, going on to win the general election for his first term leading Maryland’s most populous county.