LEXINGTON, Va. (AP) -- Americans must pay attention to challenges to democracy today just as Abraham Lincoln did by fiercely opposing slavery, Supreme Court Justice Clarence Thomas told a conference on the 16th president's legacy Friday night. "We are part of something far greater than ourselves," Thomas told more than 300 people at Washington and Lee University. Many in Lincoln's time didn't realize the threat that slavery posed to the principles on which the nation was founded, Thomas said. "What a miserable job he had. He wasn't popular," Thomas said, "but he did what was right." Thomas received a standing...