Blows fans will be blows fans. I'm just sad to see so many of them don't like the Nats because they "came into their turf". That is total BS since D.C. was a baseball town before Baltimore (1886 vs. 1892). Plus Baltimore is a smaller market (yea, I said it) than D.C. is.
Be happy that someone will buy MASN and everyone wins with more money.
I think Washington had a professional team in the early 1870s...probably called the Nationals. Best I remember is that there were two organized teams, the Potomacs and the Nationals, and the Nationals turned pro. The Potomacs were a group of gentleman clerks from the US government. This is by memory from the Shirley Povich book. Fans began to call the team the "Senators" in the 1880's, but Povich did not know why...and he started covering the team in 1924, so he might have met fans from 1885.
The current Orioles were the StL Browns until about 1954, when they moved into Nats' territory as the Orioles, taking the name of Baltimore's minor-league team. A previous Baltimore Orioles might have been an early member of the American League, maybe the first season, after which they moved to New York as the Highlanders.
Therefore, classic Baltimore baseball is Wee Willie Keeler and the Baltimore Chop. Then the Bush League Baltimore Orioles for more than 50 years.
Washington is a big metropolitan area ("Standard Metropolitan Statistic Area", or SMESA in urban economics). Baltimore is not so big. Simple as that.