At least if you are worried about a playoff spot.
July 22nd - Nats lead ATL by 3.5, PIT by 3.5, LA by 4, and STL by 5.5
August 2nd - Nats lead ATL by 2.5, PIT by 2.5, STL by 5.5 and LA by 6.
Remember it's not enough for the Nats to get passed by ATL and PIT. That makes ATL the NL East winner and takes them out of the WC race. They need to get passed by ATL AND two other teams. The 2nd team has gained no ground in the past week and a half and there is one fewer team within 4 games than there had been at that time.
Also for all we joke about the Phillies giving up on the season, they are still an ok team, that took one step back for the rest of this year, presumably to take two steps forward for 2013 (or else signing Hamels makes no sense). After tonight the Nats have 8 games coming up versus Miami (home) and Houston (away). These weren't good teams to begin with and they also took steps back. 5 wins? 6? more?
As for the NL East - nothing has changed. The series with the Braves starting on the 20th will likely be the first chance for the Nats to feel safe about that pennant. Right now it's about getting to that series in the best possible shape.