The decision to ‘look forward, not back’ on Iraq was a profound mistake. In Thursday’s Wall Street Journal, Karl Rove offered a candid confession. His biggest mistake as a top White House adviser, he wrote, was to endorse the decision not to mount a vigorous defense when Democrats accused President Bush of lying the nation into the invasion of Iraq. After amply demonstrating that those who leveled this shameful charge had themselves previously insisted that Saddam was a WMD menace, Rove explains: At the time, we in the Bush White House discussed responding but decided not to relitigate the past....