Responding to polls showing that a strong majority of Americans support building a wall across the U.S.-Mexican border, 2008 presidential hopeful Hillary Clinton announced Saturday that she backs a border wall plan that would be supplemented by a "smart fence." "A physical structure is obviously important," Mrs. Clinton told the New York Daily News. "A wall in certain areas would be appropriate." The News said she also supported deploying a high-tech "smart fence" that could spot people approaching from 200 or 300 yards. Clinton also said the deployment of surveillance drones and infrared cameras should also be considered. A Time...