The result was predictable. And predicted. Overnight, Iran and its promotion of Shiite supremacy became the dominant influence in Iraq. The day after the U.S. departure, Maliki ordered the arrest of the Sunni vice president. He cut off funding for the Sons of Iraq, the Sunnis who had fought with us against al-Qaeda. And subsequently so persecuted and alienated Sunnis that they were ready to welcome back al-Qaeda in Iraq — rebranded in its Syrian refuge as the Islamic State of Iraq and Syria — as the lesser of two evils. Hence the stunningly swift ISIS capture of Mosul, Tikrit and so much of Sunni Iraq.

But the jihadist revival is the result of a double Obama abdication: creating a vacuum not just in Iraq but in Syria. Obama dithered and speechified during the early days of the Syrian revolution, before the jihadists had arrived, when the secular revolt was systematically advancing on the Damascus regime.

Hezbollah, Iran and Russia helped the regime survive. Meanwhile, a jihadist enclave (including remnants of the once-routed al-Qaeda in Iraq) developed in large swaths of northern and eastern Syria. They thrived on massive outside support while the secular revolutionaries foundered waiting vainly for U.S. help.