U.S. Rep. Chris Van Hollen says he will run for the Senate seat that will be open when Barbara Mikulski retires.
Van Hollen, a Democrat from the Washington suburbs, announced his plans in an email to supporters Wednesday. His email was sent two days after Mikulski announced she would not run for re-election in 2016.
Van Hollen, who has been a congressman since 2003, wrote that a more formal announcement of his Senate bid will come later.
He will be running in what could be a crowded race, with a variety of Democrats considering a run. Rep. John Delaney already has indicated he will explore a Senate run.
Maryland Republicans also are taking an interest in the seat, which Mikulski, a Democrat, has held since 1987.
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