Why should I? That was never the intent. Under that version, the USSC never could have overturned Lopez and Morrison, now could they?
How about: "Congress shall have the power to regulate commerce among the several states, and shall have the power to make all laws necessary and proper to effect such regulation."
Golly. So radical, huh?
In other words, to make sure that all regulations that it chooses to make will be effective? That's not what the Constitution says.