Answer
Jamaal Bowman, a former middle school principal and political newcomer, unseated Eliot Engel, the 16-term incumbent Democratic congressman from New York's 16th congressional district, in the 2020 Democratic primary. Bowman's victory was attributed to a combination of factors, including voter dissatisfaction with Engel's perceived establishment status, Bowman's strong grassroots support, and the national climate favoring progressive candidates.