WASHINGTON (CNN) -- Appearing before a religious conference earlier this week, Sen. Hillary Rodham Clinton (D-New York) told the audience that as a child attending Sunday school she would baby-sit the children of migrant workers so that their older siblings could join their parents at work. "I was fortunate that at an early age, through my church, I was given the opportunity to expand my horizons," Clinton told the 600 adults and teenagers attending the Sojourners "Covenant for a New America" conference. Politically, the story served two purposes for the New York Democrat. It allowed her to promote a developing...