The billionaire hedge fund manager at the center of an alleged fraud hatched at Goldman Sachs, a leading investment bank, has given tens of thousands of dollars to both parties. Campaign fundraising records show that John A. Paulson, founder and chairman of the hedge fund Paulson & Co., gave $30,400 to the Democratic Senatorial Campaign Committee in June, qualifying him as a major Democratic donor. He also gave $2,300 to Senate Majority Leader Harry Reid’s (D-Nev.) reelection campaign in February of last year and $4,800 to Senate Banking Committee Chairman Chris Dodd (D-Conn.) last April, according to records filed at...