Pittsburgh Mayor Ed Gainey, who had allied himself with progressives, has lost a Democratic primary challenge, The Associated Press reported. The AP called the race for Alleghany County Controller Corey O'Connor at 10:05 p.

The primary pitted Pittsburgh’s first Black mayor against a popular elected official whose father led the city nearly two decades ago.

The outcome is the latest in a string of losses in deep-blue cities that has raised questions about the power of progressive officeholders.