LINCOLN, Neb., May 12 (AP) - A federal judge on Thursday struck down Nebraska's ban on same-sex marriage, saying the measure interfered not only with the rights of gay couples but also with those of foster parents, adopted children and people in a variety of other living arrangements. The amendment to the state's Constitution, which defined marriage as a union between a man and a woman, was passed overwhelmingly by the voters in November 2000. The Nebraska ruling is the first in which a federal court has struck down a state ban on same-sex marriage, and conservatives in the United...