I just got a call from this number. I let the answering machine pick up, and it was a political robocall from Brian Frosh, who is running in the Democratic primary for nomination as the candidate for state attorney general.

Remember, the law exempts political candidates from the Do Not Call list -- but if you call or email one of his offices they should be able to put you on their own Do Not Call list. Here's the contact info from his website:
Chevy Chase office: 240-479-9788
Silver Spring office: 240-704-0767
Email:  brian@brianfrosh.com