It's a sample size of 406. Out of a state of nearly 3 million.
FWIW, a sample size of 406 given a population of 3,000,000 means the margin of error of the poll is merely 4.9% (in the usual 95% confidence interval).
Sure, this could be an outlier, but even the 99% confidence interval is only +/- 6.4%.
That sounds great but think about it. Road construction could conceivably block every single one of those people from going to the polls.
Call me odd, but I treat polls with a sample size of under 1000 people as little more then fun numbers. Pbrower's map is a fairly good indicator of why.
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Statistics do not work that way.