To me, this is more interesting when people adopt a team or a school that you did not go to or that is not local (or, if you grew up elsewhere, not from your area). Most folks here are going to like Washington teams and the local schools, unless you went to a rival of a local school. Those who grew up elsewhere are going to like their old home town teams.
For example, I always used to root for arkansas after watching Sidney Moncrief. I liked their Lou Holtz teams, too, so I kind of pulled for them up to my mid 30s. At various times, I've followed Seattle, Cleveland, Minnesota, and Tampa Bay as my other AL teams (I'll not count B'more, even though I am sure I have been to more games at OPACY than any other stadium except possibly Schaefer / Sullivan / Foxboro, because it was "local" before the Nats). Expos were always my NL team, like a lot of folks from Boston, due to Bill Lee, Dick Williams, the proximity, and the underdog status.