Kshama Sawant, the Seattle city councilmember who was elected four years ago, appears to have been re-elected. See this story. The race is non-partisan, but she is a member of Socialist Alternative.
From the article cited, written by Daniel Beekman:
Sawant called Tuesday’s returns “a strong victory for all working people, for the socialist movement.” She cautioned her followers that the night’s results were just “the first drop,” but that she expects her lead to grow as more ballots are counted.
Her opponent, Pamela Banks, said she wasn’t ready to give up, calling herself “the comeback kid.”
Each of the council’s nine members previously represented the whole city, under a system in use since 1911. But Seattle voters approved a ballot measure in 2013 moving seven of those nine seats to voting by district, starting with the 2015 election.