By Ellen Wulfhorst

NASHUA, New Hampshire (Jan 6, Reuters) - Democrat Hillary Clinton, her back against the wall in New Hampshire, battled to keep the state from swinging to rival Barack Obama on Sunday by accusing him of talking about change but failing to get results.

In the hotly contested Republican race, former Massachusetts Gov. Mitt Romney lashed out at Arizona Sen. John McCain two days before New Hampshire votes.

At stake is crucial momentum in New Hampshire and on both sides the race was taking a negative turn. The state is vital to efforts by Clinton and Romney to revitalize their campaigns after disappointing showings last Thursday in Iowa.

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photo: Democratic presidential candidate and U.S. Senator Barack Obama (D-IL) speaks to a campaign rally in the Palace Theater in Manchester, New Hampshire, January 6, 2008. New Hampshire's first in the nation primary will be held January 8. REUTERS/Jim Bourg