Washington, UNITED STATES: US Vice President Dick Cheney speaks during the opening session of the Veterans of Foreign Wars Legislative Conference 05 March 2007 at a hotel in Washington, DC. Cheney, who has suffered four heart attacks, sought medical attention later 05 March 2007 for a blood clot in his left leg and will have to take blood-thinning medication for months, his office said. One of the most powerful vice presidents in memory and a key architect of the war in Iraq, Cheney has since the beginning been the Bush administration’s conservative backbone and perhaps the most controversial member of Bush’s team. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)