AUSTIN -- Erica Anthony-Benavides is a junior at Trinity University in San Antonio, a member of Ladies in Physics and not very politically active. But because she signed a petition against the war in Iraq, a national conservative Internet site has declared her an enemy of America. "I don't know why they want to accuse us of treason. It's not fair. We haven't done anything. We've just said something that somebody doesn't like," said Anthony-Benavides, a native of Corpus Christi. Anthony-Benavides, 19, has been swept up in a new Internet war between the right and left in America that is...