INTERVIEW-Iraq says al Qaeda exploiting U.S. disunity over war By Ross Colvin and Dean Yates BAGHDAD, April 29 (Reuters) - The political battle in Washington over a Democratic plan to pull U.S. troops from Iraq is being exploited by al Qaeda, which has stepped up attacks to hasten a withdrawal, Iraq's foreign minister said on Sunday. Hoshiyar Zebari said Iraq had become "entangled" in domestic politics in the United States, where there is growing impatience for progress in reconciling the country's warring sects. U.S. President George W. Bush has vowed to veto a war spending bill that requires combat troops...