Not necessarily so important. While the masses will believe the propaganda; the truth is DC is NOT a state. Congress has PLENARY power over DC as enumerated by the US Constitution. Rights in DC are only those conferred by US Congress.
NRA never should have supported a case there as this makes for very negative press.
Sui
Correct you are, and that argument itself MIGHT be grounds for overturning the handgun ban, which was passed by the "Washington DC city council", and NOT, I believe, by the Congress of the United States. One could argue that only Congress has the power/authority to implement such a ban.