Senator John Kerry picked up five of the seven states holding contests for the Democratic presidential nomination on Tuesday.
Senator John Edwards won South Carolina.
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In Oklahoma, retired Army General Wesley Clark held a slight lead over Edwards with all precincts reporting. But the race is so close that no winner will be declared until the state elections board certifies the vote next week.
"We will take nothing for granted," Kerry -- who won Arizona, Delaware, Missouri, North Dakota and New Mexico -- told supporters gathered in Seattle, Washington, where caucuses are scheduled on Saturday. "We will compete everywhere. And in November, we will beat George W Bush," he said.
Senator Joe Lieberman of Connecticut bowed out after it became clear he had no chance of winning any of the states.
"I have decided tonight to end my quest for the presidency," he told supporters at a meeting in Arlington, Virginia.
Former Vermont Governor Howard Dean vowed to stay in the race, despite performing poorly in all seven states.