Alameda County supervisorial candidate Bryan
Parker and Rep. Eric Swalwell.

Bryan Parker’s bid for Alameda County supervisor will get a major bump Wednesday. Popular East Bay Rep. Eric Swalwell is expected to announce his endorsement of the upstart challenger over long-time Alameda County Supervisor Nate Miley.

On social media, Parker said Monday a “major announcement” would come on Wednesday. Parker confirmed the announcement is about Swalwell. In fact, Parker’s volunteers, while campaigning door-to-door Monday was already touting the Tri Valley congressman’s support, he said.

Swalwell’s endorsement could upend this race since his popularity is the highest in the places Parker’s campaign believes is the key to the sprawling District 4—Pleasanton and Castro Valley. Roughly half of the district also includes East Oakland.

The announcement is also significant because of Miley’s incumbency. Entrenched Democrats in Alameda County almost always back their colleagues for re-election, except when they don’t.

Although, Miley was one of the first local politicians to endorse Swalwell’s during his insurgent 2012 run against Pete Stark, two years later, Miley endorsed Swalwell’s Democratic challenger, Ellen Corbett in the June primary.