In the case of McDonald v. the City of Chicago, the Supreme Court of the United States ruled that the Second Amendment applies to the states. Read the decision here. The decision was 5-4 which is absolutely stunning since I think that there was no intellectually respectable argument to be made that the Second Amendment does not apply to the states.
The bill of rights applies to the States due to the Fourteenth Amendment. In the opinions written by the majority justices, emphasis is given to the importance that the drafters of the Amendment placed upon the rights of freed slaves after the Civil War to keep and bear arms for their defense. A good day for the Constitution at the Supreme Court.
Update: Scalia’s concurring opinion is a treat to read. I especially like this going away present to Justice Stevens:
The next constraint JUSTICE STEVENS suggests is harder to evaluate. He describes as “an important tool for guiding judicial discretion” “sensitivity to the interaction between the intrinsic aspects of liberty and the practical realities of contemporary society.” Post, at 24. I cannot say whether that sensitivity will really guide judges because I have no idea what it is. Is it some sixth sense instilled in judges when they ascend to the bench? Or does it mean judge sare more constrained when they agonize about the cosmic conflict between liberty and its potentially harmful consequences? Attempting to give the concept more precision, JUSTICE STEVENS explains that “sensitivity is an aspect of a deeper principle: the need to approach our work with humility and caution.” Ibid. Both traits are undeniably admirable, though what relation they bear to sensitivity is a mystery. But it makes no difference, for the first case JUSTICE STEVENS cites in support, see ibid., Casey, 505 U. S., at 849, dispels any illusion that he has a meaningful form of judicial modesty in mind.
JUSTICE STEVENS offers no examples to illustrate the next constraint: stare decisis, post, at 25. But his view of it is surely not very confining, since he holds out as a “canonical” exemplar of the proper approach, see post, at 16, 54, Lawrence, which overruled a case decided a mere 17 years earlier, Bowers v. Hardwick, 478 U. S. 186 (1986), see 539 U. S., at 578 (it “was not correct when it was decided, and it is not correct today”). Moreover, JUSTICE STEVENS would apply that constraint unevenly: He apparently approves those Warren Court cases that adopted jotfor-jot incorporation of procedural protections for criminal defendants, post, at 11, but would abandon those Warren Court rulings that undercut his approach to substantive rights, on the basis that we have “cut back” on cases from that era before, post, at 12.