Congratulations on Florida. Now that you are again the front-runner, and your campaign focus is returning to President Obama, I’d like to call attention to a line you have used repeatedly: “This is a president who fundamentally believes that this next century is the post-American century.” I leave it to the president to describe what he believes, but as the author of the book “The Post-American World,” let me make sure you know what exactly you are attacking.

Europe is facing its most severe challenge since 1945. If the Greek crisis morphs into an Italian crisis, the entire structure of post-World War II Europe could unravel. Finally, European leaders seem to recognize that their strategy of kicking the can down the road has not worked. The result will not be a dramatic solution — that is not how Europe works — but, more likely, a series of steps that together will be more comprehensive than anything done before. Still, they will not address Europe’s core problem: a lack of growth.

Consider the intelligence community. We spend around $80 billion on intelligence every year — more than the rest of the world put together — and yet we seem perpetually unprepared for global events. The CIA did not imagine the fall of the Soviet Union, the revolutions of Eastern Europe, the breakup of Yugoslavia, Sept. 11, Saddam Hussein’s nonexistent arsenal of weapons of mass destruction, the global financial crisis and, most recently, the Arab Spring.