When she was about 14, Hillary Clinton says, she wrote to NASA volunteering for astronaut training. More than a half-century later, and after much hard work, much determination, and most of all, many, many obstacles — some undeniably of her own making — Clinton is no closer to actual space travel. Americans first knew her as a governor's working wife in Arkansas, then as the nation's first lady — half of Bill Clinton's "Buy one, get one free" bargain. Touched by scandal, she nonetheless emerged to become a hard-working senator, the first first lady to gain elected office. [...] she reinvented herself again, becoming Obama's secretary of state, traveling to 112 countries. [...] there's also a sense of impenetrability, exacerbated by Clinton's penchant for secrecy — a characteristic that's led to her greatest vulnerability now: the email scandal. Comedy aside, the ambition tag has dogged Clinton, 68, as if it were a bad quality rather than a necessity. The satirical website The Onion captured the irony: "Hillary Clinton Is Too Ambitious To Be The First Female President." "Young people today ...