Horsford, who previously ran a job training program associated with the politically powerful Culinary Union, said Biden has worked side by side with labor. He also cited Biden's work to pass the Affordable Care Act.
Horsford, who was elected to his southern Nevada seat in 2018 and previously held the seat for one term ending in 2015, joins one other member of Nevada's Democratic congressional delegation in making an endorsement.
Rep. Dina Titus, a Democrat who represents Las Vegas, backed Biden in November. Most of Nevada's high-profile politicians, including former Senate Majority Leader Harry Reid, have refrained from making an endorsement in the crowded Democratic presidential field.
Horsford is a member of the Congressional Black Caucus and was the first African American majority leader of the Nevada Senate from 2009 to 2013.
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