Judge Reed O'Connor made my list to replace Ruth Bader Ginsburg on the Supreme Court when he declared Obamacare unconstitutional.

Chief Justice Roberts famously said that the Affordable Care Act (Obamacare) was constitutional because it was a mere tax, a task for which the federal government has been given authority. Not questioned by Chief Justice Roberts was if the purpose of the tax was to be applied to a constitutional purpose, which of course it was not, as we now know. For once the Republican Congress removed the tax, federal judge Reed O'Connor in Texas struck down the Affordable Care Act as unconstitutional. Just as Justice Roberts should have already decided beforehand.

Well then, what about the constitutionality of Social Security?  Is the FICA tax the only part saving forced Social Security contributions from being declared unconstitutional?