President Obama has unveiled his plan tonight for a withdrawal of U.S. troops from Afghanistan.Mr. Obama says the U.S. will pull out 10,000 troops by the end of this year, with a total of 33,000 brought home by next summer.There are currently 100,000 U.S. troops in Afghanistan, and there have been demands in Congress and elsewhere for a bigger pullout.Congressman John Yarmuth of Louisville was among those hoping for a larger immediate drawdown.Yarmuth, a Democrat, has criticized the war in Afghanistan as lacking a clearly-defined mission and metrics for measuring success.He and dozens of other House lawmakers from both parties sent a letter to the president Tuesday, urging him to begin a “significant and sizable” troop reduction in Afghanistan.(Information for this story also came from the Associated Press)