The Department of Justice has opened an investigation into the fundraising activities of Norman Hsu, the man who put over a million dollars into Democratic coffers while remaining a fugitive con man. They want to find out whether more than just coincidence linked heavy donation activity between Hsu and at least two households of more modest means -- and the answers could prove very embarrassing for top Democrats: The U.S. Justice Department is investigating possible campaign-finance violations by top Democratic fundraiser Norman Hsu, according to people familiar with the probe. On Friday, Mr. Hsu surrendered to California officials on...