WASHINGTON (Reuters) - Sen. Hillary Clinton, viewed last year as virtually unstoppable in her bid to become the U.S. Democratic presidential nominee, is now seeking to portray herself as the underdog against rival Sen. Barack Obama.

The Clinton campaign has labeled the Illinois senator the "establishment" candidate as she tries to wrest from him the message of a vow to bring change to Washington.

But political analysts saw some irony in the New York senator's effort to seek the status of a challenger to the establishment, given that she has been a household name since her husband, Bill Clinton, ran for president in 1992.

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