DC files in Parker
DC has reportedly filed for cert. in Parker.
UPDATE: they did indeed. Here's the petition. Basically sophisticated collective rights (with additional argument that 2nd A. was meant to protect states against the federal government, and DC is not a state but the seat of the federal government, and a handgun ban is reasonable regulation since it's only aimed at one type of gun which is nasty.
[Update: filing an amicus basically involves (1) find a suitable person or group on whose behalf it can be filed. Usually a group. I've never heard of an individual, though that may have been done somewhere and I just never heard of it. (2) Someone to write the brief. (3) Finding an area to write it on, which means coordinating with other amici. Courts *hate* it when you have a bunch of amici who just pick the 2-3-4 most obvious issues, which are probably already covered in the parties' briefs, and write on that. The court winds up reading the same point over and over. (4) Financing. Supreme Court briefs have to be printed. As in a printing press, and preferrably a printer who specializes in that. When last I briefed in the Supreme Court, the cost of a party brief was several thousand bucks. Amicus briefs can be a lot shorter, but prices have probably risen in the 15 years since I picked up that tab.]