The Associated Press called the race on Tuesday night for Ms. Alsobrooks, 53, who defeated Representative David Trone, a wealthy congressman who spent more than $61 million of his own money on the race.
While Ms. Alsobrooks, a former prosecutor, trailed Mr. Trone early in the race, she was buoyed by widespread support among Maryland's Democratic elected officials, who rallied around her campaign.
Ms. Alsobrooks and Mr. Hogan will compete to replace Senator Benjamin L. Cardin, who is retiring after holding the seat since 2007.
The primary between Ms. Alsobrooks and Mr. Trone turned negative as it tightened, splitting Democrats in Congress and beyond.
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