If you are interested in rooting for teams based on former Nats that played for them this season, here you go. (and let me know if I missed any - it was late when I put this together)
Jerry Hairston Jr
Wily Mo Pena
Armando Galarraga (ok he didn't really ever play for the Nats but it feels like it, doesn't it?)
(thanks Steven at FJB for a couple more names - and yes, I cut the Rays out. Losers walk. Oh and I don't count the days of Colby Lewis in Spring Training. Only Major League experience and guys we've argued about his level of importance in a trade for years)
*FINE - on Postseason rosters. It's not like anyone other than Morgan will get significant time in important innings.