I was surprised how few Cardinals fans were at the games in DC. There are usually quite a bit more during the regular season games. I have family near Champaign, Illinois and their town is pretty evenly split between Sox, Cubs and Cards fans.
I was surprised too. Cardinals supporters used to turn out pretty heavily in RFK days and on into the first season or two at Nats Park - not as heavily as Mets or Cubs supporters at that time, but enough that if one was in the loo or on a beer queue and a roar went up from the crowd, one couldn't tell whether it was a good play by the Nats or the Cards.