They put it right there in the beginning, in case you have ADD (conservatism) and can't read the whole thing:

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; but all Duties, Imposts and Excises shall be uniform throughout the United States;

"general Welfare"
"general Welfare"
"general Welfare"
"general Welfare"
"general Welfare"

Our forefathers knew the ulra rich, ulra elite (ultra conservatives) would try to take away those rights, so they spelled it out!