Jack Balkin warns liberals not to cheer the new DOMA cases.

He supports same-sex marriage (and other liberal causes) but he's got a big problem with using the Tenth Amendment:

Judge Tauro ... wants to say that marriage is a distinctly state law function with which the federal government may not interfere. But the federal government has been involved in the regulation of family life and family formation since at least Reconstruction, and especially so since the New Deal. Much of the modern welfare state and tax code defines families, regulates family formation and gives incentives (some good and some bad) with respect to marriages and families....

In both opinions, Judge Tauro takes us through a list of federal programs for which same sex couples are denied benefits. But he does not see that even as he does so, he is also reciting the history of federal involvement in family formation and family structure. His Tenth Amendment argument therefore collapses of its own weight. If the federal government cannot interfere with state prerogatives in these areas, why was it able to pass all of these statutes, which clearly affect how state family law operates in practice and clearly give incentives that could further, undermine, or even in some cases preempt state policies?...

The modern state depends heavily on the federal government's taxing and spending powers for many of the benefits that citizens hold dear, including Medicare, Medicaid, Social Security, and the newly passed provisions of the Affordable Care Act. These programs have regulatory effects on state family policies just as much as DOMA does. If DOMA's direct interference with state prerogatives is beyond federal power, then perhaps any or all of these programs are vulnerable-- and unconstitutional-- to the extent they interfere with state policies regarding family formation as well. Put differently, Judge Tauro has offered a road map to attack a wide range of federal welfare programs, including health care reform. No matter how much they might like the result in this particular case, this is not a road that liberals want to travel.

Does this mean conservatives should cheer?