Krugman reads the writing on the wall, and comes to the conclusion that I've been arguing for a few weeks: if Bush is going to attack Iran he's going to do it through Iraq:

So the administration has always had it in for the Iranian regime. Now, let’s do an O. J. Simpson: if you were determined to start a war with Iran, how would you do it?

First, you’d set up a special intelligence unit to cook up rationales for war. A good model would be the Pentagon’s now-infamous Office of Special Plans, led by Abram Shulsky, that helped sell the Iraq war with false claims about links to Al Qaeda....

Next, you’d go for a repeat of the highly successful strategy by which scare stories about the Iraqi threat were disseminated to the public.

This time, however, the assertions wouldn’t be about W.M.D.; they’d be that Iranian actions are endangering U.S. forces in Iraq. Why? Because there’s no way Congress will approve another war resolution. But if you can claim that Iran is doing evil in Iraq, you can assert that you don’t need authorization to attack — that Congress has already empowered the administration to do whatever is necessary to stabilize Iraq. And by the time the lawyers are finished arguing — well, the war would be in full swing.