Andrew McCarthy addresses the issue much more effectively than I can.
http://www.nationalreview.com/articles/284393/andrew-napolitano-s-mistake-andrew-c-mccarthy?pg=1
He contends that this is not just any enemy but mark my words some president will interpret this to be groups of people in the USA. How many have thought that the SC could give the right to kill a baby in the womb under the commerces clause, or forcing people to buy insurance under the commerce clause. If this did not give any new powers to the president then why write the bill to do so? Let say that in 2012 that BO is defeated and masss rioting breaks out in large cities do you think that they will set back and let the locals handle it while the cities burn? No they will call in the military.