For pollsters, finding accurate sample is art and science

Obama's lead fluctuates greatly

By Brian C. Mooney

Globe Staff / October 28, 2008

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With a week before the election, Democratic presidential candidate Barack Obama has not trailed Republican John McCain in a national public poll in more than a month, but his lead fluctuates greatly in some surveys as pollsters mix art and science as they try to predict who will actually vote. (Full article: 675 words)