At last it can be told. The mystery of why New York Sen. Hillary Clinton was willing to sacrifice her self-respect and her dignity to stay in a humiliating marriage to ex-President Clinton is a mystery no longer. She did it to save America. In her book "Living History," Mrs. Clinton recalls that after she learned about Monica Lewinsky, "I knew what I did and said in the next days and weeks would influence not just Bill's future and mine, but also America's." "Bill's Presidency, the institutional Presidency and the integrity of the Constitution hung in the balance," Hillary...