|U.S. Supreme Court Justice Clarence Thomas|
Is DOMA a valid exercise of federal power or does it violate the U.S. Constitution?: "Among the scholars who signed on to the brief [argues that it's an unconstitutional use of federal power] is Georgetown law professor Randy Barnett, one of the legal architects behind last year’s Obamacare challenge and also the losing lead attorney in the 2005 medical marijuana case Gonzales v. Raich. Justice Clarence Thomas accepted Barnett’s theories on the limits to federal power in both those cases and has also cited Barnett’s work in other opinions. But just as important, Thomas has a tendency to break with the Supreme Court’s conservative bloc when federalism principles are at stake in a case that is otherwise seen to advance a liberal political agenda — which is basically the Defense of Marriage Act controversy in a nutshell."