Melanie Phillips sums it up

I do not trust McCain; I think his judgment is erratic and impetuous, and sometimes wrong. But on the big picture, he gets it. He will defend America and the free world whereas Obama will undermine them and aid their enemies. ... He has said he will ‘cut investments in unproven missile defense systems’; he will ‘not weaponize space’; he will ‘slow our development of future combat systems’; and he will also ‘not develop nuclear weapons,’ pledging to seek ‘deep cuts’ in America’s arsenal, thus unilaterally disabling its nuclear deterrent as Russia and China engage in massive military buildups.