Barack Obama is ambling rather than sprinting across the primary-season finish line. It's not just his failure to connect with blue-collar Democrats. He has added to his problems with ill-informed replies on critical foreign policy questions.

On Sunday at a stop in Oregon, Sen. Obama was dismissive of the threats posed by Iran, North Korea, Venezuela, Cuba and Syria. That's the same Iran whose Quds Force is arming and training insurgents and illegal militias in Iraq to kill American soldiers; that is supporting Hezbollah and...