Del. Talmadge Branch said Thursday he will run for the seat.
Branch, a Democrat, is the majority whip in the Maryland House of Delegates. He has been a state legislator since 1995.
State Sen. Jill Carter announced this week she has formed an exploratory committee to consider running for the seat.
Republican Liz Matory has announced she plans to run.
Gov. Larry Hogan has set a special primary election for Feb. 4. The special general election has been scheduled for April 28.
Cummings died Oct. 17 at the age of 68.
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