Josh Marshall gets it out straight here:
But this is really just the tip of the iceberg with McCain. In almost every discussion of foreign policy, not just today but in previous years, what stands out is McCain's inability to see beyond the immediate issues of military tactics to any firm grasp of strategy or America's real vital interests. His free willingness to commit to a decades long occupation of Iraq is an example, his push for ground troops to be introduced during the Kosovo War is another. His refusal, almost inability, to grapple with the political failure of the surge is the most telling one if people will sift through its deeper implications...
Hillary Clinton has stipulated to McCain's qualifications as Commander-in-Chief; and Obama, implicitly, does the same. But his record actually shows he's one of the most dangerous people we could have in the Oval Office in coming years -- not just because he's a hothead in using the military, but more because he seems genuinely clueless about the real challenges and dangers the country is facing. He's too busy living in the fantasy world where our future as a great power and our very safety are all bound up in Iraq.
Yes, a hothead and an Iraq obsessive (not to mention a lunatic on Iran). McCain would indeed be a disaster as Commander in Chief, and progressives need to communicate this to the world.