If you’ve been waiting, as I have, for an intelligent, focused and spirited debate about invading Iraq, your wait is over. No, it’s not occurring in the halls of Congress or in the opinion pages of The New York Times or on CNN in non-primetime hours. It’s taking place at Slate, the online magazine, which has begun a “dialogue” among its writers. The series got off to a snoozy start but anti-invasion offerings by Robert Wright (you’ll need to scroll down to it) and others led to a withering rebuke from Jeffrey Goldberg (again, you’ll need to scroll down to it), to which Wright shot back (scroll once more), eliciting another salvo from Goldberg, to which Steve Chapman took immediate exception. It’s smart and riveting stuff; I don’t know of any place where you’ll find sharper arguments in favor of, and against, an invasion of Iraq.