More on Obama's "Federalism"

David Harsanyi makes the same point I did below about the inconsistency of Obama's views on states' rights:

If Obama has endorsed federalism and believes that states have the right to define marriage, then why doesn't he support the ability of states to extricate themselves from Obamacare? Why don't states have the right to dictate their immigration laws? And does he “personally” believe that states should be able decide the issue of abortion? Roe v. Wade exists, but so does the Defense of Marriage Act....

Whatever you think of gay marriage -- and I've long taken the position that government should get out of the marriage business altogether -- if federalism can apply here, why not elsewhere?