WASHINGTON (Reuters) - The general who led U.S. forces in Iraq after the invasion launched by Republican President George W. Bush spoke out for Democrats on Saturday, backing legislation aimed at withdrawing American troops. Retired Lt. Gen. Ricardo Sanchez, in the Democratic weekly radio address, acknowledged that Bush's escalation strategy this year had improved security in Iraq. But he said Iraqi political leaders had failed to make "hard choices necessary to bring peace to their country." "There is no evidence that the Iraqis will choose to do so in the near future or that we have an ability to force...