Hillary Clinton, the former First Lady, yesterday launched her historic attempt to return to the White House as president with the bold declaration: "I'm in. And I'm in to win."The Democrat senator for New York, who aims to become the first woman to hold the nation's highest office, announced the formation of a presidential exploratory committee, the final stage before a formal declaration, in a hard-hitting statement and video on her website. Mrs Clinton, 59, revealed her plans just five days after her main rival for the Democratic nomination, Sen Barack Obama, took the same step – as the most...