It may have seemed like Charles Krauthammer was going a little wobbly lately, writing about Obama’s “presidential temperament” and criticizing Sarah Palin, but today’s column makes it exceedingly clear which side he’s on: McCain for President.

The case for McCain is straightforward. The financial crisis has made us forget, or just blindly deny, how dangerous the world out there is. We have a generations-long struggle with Islamic jihadism. An apocalyptic soon-to-be-nuclear Iran. A nuclear-armed Pakistan in danger of fragmentation. A rising Russia pushing the limits of revanchism. Plus the sure-to-come Falklands-like surprise popping out of nowhere.

Who do you want answering that phone at 3 a.m.? A man who’s been cramming on these issues for the past year, who’s never had to make an executive decision affecting so much as a city, let alone the world? A foreign policy novice instinctively inclined to the flabbiest, most vaporous multilateralism (e.g., the Berlin Wall came down because of “a world that stands as one”), and who refers to the most deliberate act of war since Pearl Harbor as “the tragedy of 9/11,” a term more appropriate for a bus accident?

Or do you want a man who is the most prepared, most knowledgeable, most serious foreign policy thinker in the United States Senate? A man who not only has the best instincts but has the honor and the courage to, yes, put country first, as when he carried the lonely fight for the surge that turned Iraq from catastrophic defeat into achievable strategic victory?

There’s just no comparison. Obama’s own running mate warned this week that Obama’s youth and inexperience will invite a crisis — indeed a crisis “generated” precisely to test him. Can you be serious about national security and vote on Nov. 4 to invite that test?