Obama believes in the manipulation of the Constitution. And counts on everyone to be stupid enough to let him. Ask Gruber.
Here, read it again, this time with an open mind.
"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America."
As you can see it's all about the people, not we the commerce, not congress, not even about the president, just about we the people and promoting their general welfare.