A small point of clarification… Article I, Section 8 gives the power to declare war to Congress only. The president becomes commander and chief of the military once they are activated by a declaration from congress. This is not unlike any other provision of law… congress makes it and the president enforces it.
Of course as presidents will do, LBJ stretched presidential authority in VietNam and congress wanting to restrain the president enacted the War Powers Act… and again, as presidents do, subsequent presidents have abused its authority. It was designed with the flexibility for the president to act immediately in case of imminent danger… now presidents take it as a blank check to pound anyone they choose for 60 days…
While I agree with you that Obama showed a limp wrist about US resolve in ‘DEFENDING’ ourselves, our constitution never intended for us to use the power we give to the federal government to defend our nation as a grant to be the worlds policemen or moral dictator.