In Sarah Palin’s opposition to the construction of a Muslim community center in lower Manhattan, she has revealed, once more, why she must never serve as president of the United States. We are a nation at war. And the president is the commander-in-chief, a job that requires cold--sometimes cruel--calculation of the national interest, and a rigid sense of discipline. The United States is a superpower, with economic and military interests that govern the future of millions of lives, and fortunes. The decisions made in the Oval Office are truly momentous. They demand the strongest character. Especially in wartime--and we will...