Bloomberg’s Christopher Stern reports on Barack Obama’s Total Information Awareness: Almost 2 million people have entered personal information on Obama pages on social-networking Web sites such as Facebook, MySpace and his campaign’s mybarackobama.com, offering home addresses, phone numbers, their views on specific issues and the names of friends. The data have allowed Obama, 46, to raise more than $200 million, fill sports arenas with supporters across the nation and motivate