A survivor of several heart attacks, Cheney's health was too precarious to run for president. In March 2007 he had surgery to remove a blood clot in his leg, the result of extended periods of sitting while airborne. | A survivor of several heart attacks, Cheney's health was too precarious to run for president. In March 2007 he had surgery to remove a blood clot in his leg, the result of extended periods of sitting while airborne. |