DUARTE, Calif. -- A billboard seeking to encourage the public to call Sen. Barbara Boxer, D-Calif., to persuade her to support legislation intended to reduce illegal immigration was unveiled Thursday by an online group. The billboard, located adjacent to the westbound Foothill (210) Freeway in Duarte, has an outline of the U.S.-Mexico border, the phrases "Stop The Invasion" and "Secure Our Borders" and the telephone number of Boxer's Los Angeles office. The billboard was rented by funds donated by California members of the online group Grassfire.org, according to Steve Elliott, its founder and president. "This is an invasion that American...