[Publius Valerius]

The Supreme Court has held that “exclusive” simply means the ceding states would retain no authority over the District; it does not mean that the power is nondelegable.

Check out District of Columbia v. Thompson Co.

[muawiyah]

The Supreme Court obviously erred in its earlier decision. Now that they have a Liberal Shibboleth at stake they'll find it much easier to "give up" the DC government than mess with the Second Amendment.

BTW, you have to look at the nature of the case before you can take a Supreme Court decision at face value.