According to Rove, failing to refute charges that President George W. Bush "lied us into war" has subsequently hurt the country and is his most regrettable mistake from his years in the White House:
An uncharacteristically candid op-ed--read more.
The battering would continue, and it was a monument to hypocrisy and cynicism. All these Democrats had said, like Mr. Bush did, that Saddam Hussein possessed WMD. Of the 110 House and Senate Democrats who voted in October 2002 to authorize the use of force against his regime, 67 said in congressional debate that Saddam had these weapons. This didn't keep Democrats from later alleging something they knew was false—that the president had lied America into war. ...
The damage extended beyond Mr. Bush's presidency. The attacks on Mr. Bush poisoned America's political discourse. Saying the commander-in-chief intentionally lied America into war is about the most serious accusation that can be leveled at a president. The charge was false—and it opened the way for politicians in both parties to move the debate from differences over issues into ad hominem attacks.