Saddam Hussein’s most important Kurdish ally has defected to Kurdish-controlled northern Iraq in what officials here say is an indication that the Iraqi president’s internal support is beginning to crumble.Jowhad Herki is chief of the powerful Herki tribe and since the 1960s has supported successive Baghdad regimes in putting down revolts by fellow Kurds. He arrived in northern Iraq via London after travelling there from Baghdad for medical treatment. He is a former member of the Iraqi parliament."This is a major development that shows that they are abandoning the sinking ship," said Hoshyar Zebari, a Kurdish leader in the northern...