Oakland’s mayoral election was too close to call on Tuesday night, a setback for frontrunner and former Democratic Rep. Barbara Lee that underscores the profound voter frustration animating the progressive city’s politics.

OAKLAND — Election night results showed former Councilmember Loren Taylor holding a slim advantage over retired Congresswoman Barbara Lee in the race to become Oakland’s next mayor, though thousands more ballots tallied in the coming days could shift the outcome in either direction.

Former Democratic Rep. Barbara Lee was long considered the front-runner in the race. But Loren Taylor, a former City Council member, had gained momentum in recent weeks.