BAGHDAD (AP) — Barack Obama has made an unannounced visit to Iraq, capping his first overseas tour as president with a clandestine stop in the war zone that defined his White House bid. The president landed in Baghdad in the evening after a day of events in Istanbul, Turkey. Much of the traveling press who accompanied Obama to Europe was kept in the dark. But the Iraq visit was a badly-kept secret, with government ministers in Baghdad sparking speculation about it several days before he left the U.S. a week ago.