President Obama has decided not to execute the law known as "Defense of Marriage Act," even though, as Chief Executive of the Executive Branch of government, his job is to execute laws legislated by the Legislative Branch. Obama has judged the law to be "unconstitutional," even though judging laws is arguably the job of the Judicial Branch of government.
Wayne Allyn Root makes a good point:
What would the media's reaction have been if President Bush had decided he would no longer defend the Civil Rights Voting Act on constitutional grounds?
They would have been outraged, of course.
The Constitution is dead meat. Nobody in Washington D.C. really cares what it says or what it was intended to do.