And neither can you reinterpret.  The Constitution was a limit on govt.  You know that.

"Section 8 - The Meaning

Article I, Section 8, specifies the powers of Congress in great detail. These powers are limited to those listed and those that are 'necessary and proper' to carry them out. All other lawmaking powers are left to the states."

http://www.annenbergclassroom.org/page/article-i-section-8

"These powers are limited...".  What part of "limited" do you not understand.

"Govt's first duty is to protect the people, not run their lives." - Ronald Reagan