I'm not an alcoholic I just drink a lot.
Arlington-Mister Days 2$ on ALL Draft beers from 4-9pm. 3$ apps.
Arlington-Whitlows Rooftop-3$ domestic drafts (nothing special but its nice to be on a rooftop)
DC-Tap and Parlour-1$ beers from 5-7 than its goes upto $2 and than $3 after 9 I think.
XII Lounge has a decent happy hour, half off beers and good variety of music.
Also, 18th Amendement in cap hill. $3 drafts till 7, half off pizza also. Decent food plus I dj there on 1st and 3rd saturdays so I gotta give them a plug.