President Bush on Saturday backed a resolution to amend the Constitution to define marriage as a union between a man and a woman even though the idea has little chance of being passed in the Senate. "Ages of experience have taught us that the commitment of a husband and a wife to love and to serve one another promotes the welfare of children and the stability of society," Bush said in his Saturday radio address. "Marriage cannot be cut off from its cultural, religious and natural roots without weakening this good influence on society." Democrats say Senate floor time is...