Is it in the Democrat Party's interest that the DC Circuit Court's Opinion on Guns be upheld?

George Will sure seems to think so:

If the Supreme Court reverses the appeals court's ruling and upholds the D.C. gun law, states and localities will be empowered to treat the Second Amendment as the D.C. law does -- as a nullity. This will bring the gun control issue -- and millions of gun owners -- back to a roiling boil. That is not in the interest of the Democratic Party, which is supported by most ardent supporters of gun control.

I am not sure that this is true, and even if I was, I am even less convinced that they would make the right decision. The horrible Kelo decision by the Supreme Court doesn't really seemed to have produced much of a backlash.