Pittsburgh Mayor Ed Gainey (D) has lost the Democratic primary to a moderate challenger, Decision Desk HQ projects.

The progressive Gainey, the city’s first Black mayor, lost to Alleghany County Controller Corey O’Connor, the son of former Mayor Bob O’Connor (D).

The race in the heavily Democratic city, which hasn’t elected a Republican mayor in more than 90 years, is the latest battle between the progressive and moderate wings of the party following its loss in the presidential election in November.

Gainey was first elected four years ago after ousting........

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