DOMA's Days Are Numbered

The president is essentially saying "I think that DOMA is unconstitutional, but I disagree in that I think the health care program is constitutional." There is an entire 200 years worth of presidents disagreeing with the court system. Now if the health care program makes it to the court system, they can then say it's unconstitutional and make rulings against it, but until they the president can do whatever he wants.

federal law > state law. I think you're mis-interpreting the 10th amendment; it states that any powers not given to the federal government is the state's right. And in that sense, the law is unconstitutional because the federal government was not given the right to define marriage. But this does not mean state law supersedes federal law. Article IV of the constitution says that the constitution is the "law of the land," and most of the time when state and federal laws conflict, federal wins.

You are correct in that when state laws conflict with the laws that are stated in the constitution and bill of rights, the federal government will win. That said, you also made my point with the health care part as well. The federal government does not have the right to define marriage and by that same token it also does not have the right to force the people to have to get health coverage. That is one reason Obama care is unconstitutional.