Nats have been surprisingly competitive against the Cardinals at home, despite the large opposition turn-outs (I still remember the Nats carrying a no-hitter into the late going against them back in RFK days):
2005 - 2L-1W
2006 - 2W-1L
2007 - 3W
2008 - 2L-1W
2009 - 3L-1W
2010 - 3W-1L
Aggregate 11W-9L