In November 2022, Oakland resident Ima Ekong went to her local polling place to cast her vote in the city’s mayoral election. Two years later, she says she’s still unclear how ranked-choice voting, the ballot system used in city elections, selects winners and losers. “I think it is really confusing,” she said.    Ekong is not alone. The 2022 election put a spotlight on ranked-choice voting with the surprise victory of Sheng Thao over Loren Taylor in the Oakland mayoral race…