The hours of congressional testimony, the speeches and the press conferences this week were all, nominally, about Iraq. But another, equally explosive question - what to do about Iran - loomed over the presentations by Army Gen. David Petraeus, the American military commander in Iraq, over U.S. Ambassador to Iraq Ryan Crocker and over U.S. strategy for the Middle East. Petraeus and Crocker, arguing that there has been progress in stabilizing Iraq since President Bush ordered a troop build-up there last year, fingered Iran's support for Shiite militias in Iraq, which they called "special groups," as the No. 1 threat...