PIMO Jessyn Farrell might be the one.
She will have to provide a reason for me no not endorse/support/vote for her (which is entirely possible), or somebody even better would have to declare their candidacy by 5/19/2017.
"Every candidate is going to talk about being progressive," Farrell said. "I'm the progressive candidate who actually has a track record."State Representative Jessyn Farrell Is Running for Mayor - Slog - The Stranger
http://www.thestranger.com/slog/2017/05/12/25142305/state-representative-jessyn-farrell-is-running-for-mayor
I may have spoke too soon. Signing on to oppose the SODO arena project is a disadvantage that can't be overcome.