By John Whitesides, Political Correspondent
WASHINGTON, Feb 12 (Reuters) – Democrat Barack Obama hopes to extend his winning streak over rival Hillary Clinton on Tuesday, when voters in three battlegrounds make their choices in a close and bruising Democratic presidential race.
Republican front-runner John McCain and his last major challenger, former Arkansas Gov. Mike Huckabee, also square off in Virginia, Maryland and the District of Columbia as McCain tries to move closer to clinching the party’s nomination.
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