By Steve Holland and Jonathan Allen WASHINGTON/NEW YORK (Reuters) – Hillary Clinton will announce her second run for the presidency on Sunday, starting her campaign as the Democrats' best hope of fending off a crowded field of lesser-known Republican rivals and retaining the White House. The overwhelming favorite for the Democratic presidential nomination, Clinton will nonetheless face multiple challenges as she returns to the campaign trail seven years after losing the nomination in 2008 to Barack Obama. She has been a high-profile figure in American politics for more than two decades since her husband, Bill Clinton, won the presidency in 1992, and her fame still eclipses the other likely Democratic contenders and Republican opponents.
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