Real estate appraiser Samantha Steele, left, appears to have unseated Cook County Board of Review Comm. Michael Cabonargi in one of Tuesday’s biggest upsets.

Updated July 1, 9:45 a.m. For the first time in decades, voters have simultaneously ousted two sitting members of the Cook County Board of Review — an earth-shaking blow to the county’s tax assessment orthodoxy that could have far-reaching consequences for property owners from Barrington to Calumet City.

But one of the incoming commissioners has little time to celebrate as she works to fend off an explosive lawsuit from a fired campaign strategist that has already cast a cloud over her victory.