Perhaps I view this issue too simplisticly, however, IMO, it is the role of the Federal government to fulfill the mandates, and live by the restrictions stated within the Constitution......nothing more, nothing less.
Should individual states prefer through the votes of their citizens to support a quasi welfare state, allow gay marriage, allow partial-birth abortion, tax the hell out of the rich to give to the welfare class, all that is OK....the rest of us can vote with our feet, so long as the residents of states that do not support these concepts are not required to pay for them either directly or indirectly (through bailouts).
Further, IMO, the only manner in which the fallacy of "progressive" or "social democratic" governments become widely apparent to the populace are for them to be attempted, and allowed to collapse, spectacularly, the resulting chaos widely visual, and a constant reminder to the voters (California, New York, and Illinois being prime examples).
doc