Sanctuary Cities for Guns?

With the recent proposals regarding gun restrictions including the talk of an "assault weapons" ban that bans a bunch of guns that aren't assault weapons some police officials are saying that they will not enforce what they believe to be an unconstitutional restriction on gun rights.  Personally, I don't believe the gun ban is strictly constitutional.  However, I also don't think it is the purview of local officials to decide what is and is not constitutional.  If they feel they cannot enforce the laws, then resign.  This is the same view I hold with regard to "sanctuary cities" and I'm not much for hypocrisy.  What I will say, though, is that the case law of the United States Supreme Court clearly says that the States can afford protections above and beyond those contained within the Constitution, but not less.  As such, should the state, for example, Texas, pass a law that gives greater 2nd Amendment rights to its citizens, allowing for weapons covered by the "assault weapons" ban to be carried and owned by its citizenry, it is well within its rights to do so.  This would make what the sheriffs in the above story within their power to refuse to enforce the federal ban over state law.

It will be interesting to see, however, whether or not those on the left who support the "sanctuary cities" suddenly become enraged at the prospect of local sheriffs ignoring federal law.