The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States;It goes on to list the enumerated powers to which this introductory statement refers. Here's what James Madison, widely believed to be the father of the Constitution, had to say about it:
With respect to the words general welfare, I have always regarded them as qualified by the detail of powers connected with them. To take them in a literal and unlimited sense would be a metamorphosis of the Constitution into a character which there is a host of proofs was not contemplated by its creators.You are now equipped to argue with "progressives" on the enumerated powers. Now, go forth and rage against the kakistocracy.