Opposition Democrats are celebrating after making gains from President George W Bush's Republicans in the US mid-term elections.
Democrats have won control of the House of Representatives, but the race for the Senate remains very tight.
Senator Hillary Clinton, a Democratic contender for the presidency in 2008, was easily re-elected in New York.
In California, Republican Governor Arnold Schwarzenegger bucked the trend by crushing his Democratic opponent to win a second term.
Earlier, long queues formed outside voting stations in some areas of the country.
While the introduction of new electronic voting machines went smoothly in some states, others reported technical problems that delayed voting and saw polling hours extended.
President George W Bush cast his ballot at a voting station near his Texas ranch.
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