MLB Network aired its Top 50 Blasts of 2012 Friday night, and three Nats bombs made the list. Up above, #14, a screen cap of Mike Morse's 465' blast on July 20.
And then there was Tyler Moore's 462 ft. bomb at Coors Field on June 26, #21:
And of course, another blast by Morse, #47 on the list: a 452 foot bomb in Philly on September 27 which sent the Nats bullpen into a frenzy (video here).
(Screencaps via MLB Network/TV)