Three days. That is how long it took Washington to go from warning that Iraqi government elements are providing cover for Iran-backed militias to congratulating Tehran’s hand-picked prime minister and inviting him to the White House. Ali al Zaidi, a known money launderer and dollar smuggler whose Al-Janoob Islamic Bank has been under coordinated sanctions by the Iraqi Central Bank and the U.S. Department of Treasury, is now sitting in Baghdad’s …