Pro-Constantine PAC pours $118K into exec race

Constantine's campaign goes negative on Nguyen

A new committee backing King County Executive Dow Constantine’s bid for a fourth term has jumped into the race in a big way.

The committee, King County Progress, spent $118,000 on digital advertising supporting the incumbent, who has a challenge from the left this year from state Sen. Joe Nguyen.

Meanwhile, this mailer against Nguyen that highlights the…