Nope, the local Washington CBS affiliate here has told me before it is a league-enforced rule that they cannot show another football game, even a Ravens game, if the Redskins are on at the same time on another network. I had asked back when the Bills were playing the Ravens. Instead, the CBS channel showed infomercials the entire time, hardly a ratings draw.
The same goes for up in Baltimore. If the Ravens are playing, no other games, even Redskins games, can be shown on a Baltimore channel.