Hillary Clinton made history this year, overcoming personal and political setbacks, to become the first woman to win the presidential nomination of a major U.S. political party. If she wins in November, she will go from first lady to former U.S. Senator from New York and former Secretary of State, to "Madam President.” She is one of the most famous people in the world, yet some who know her personally say she is guarded about revealing too much of her personality in public.