By Associated Press Writer DOVER, Del. (AP) -- The American Civil Liberties Union has filed a federal lawsuit on behalf of a group of young women who claim their constitutional rights were violated when they were ordered to leave a book signing event featuring Pennsylvania Sen. Rick Santorum. The lawsuit, filed Tuesday in U.S. District Court in Wilmington, claims that two of the women were arrested for trespassing last year and three others threatened with arrest because of their political views. According to the lawsuit, in August the women went to a Barnes & Noble store at Concord Mall in...