This is virtually a concession

Also seen at VC:

Both opinions [in the DC handgun ban case] acknowledge that the Second Amendment challenge raises an arguable constitutional question

I see this as a major concession of legitimacy by the antigun crowd, tantamount to "You might have a point there." It's that niggling word "arguable" that Eugene used. English 1 students will recognize that adjective. Up to this point, antigunners would not allow that term to be used, meaning that a literal understanding of the Second Amendment would not be allowed on the table.

From here it's a matter of continued pressure. Be of good cheer and unrelenting energy.