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It seems to me that his one day samples fluctuate quite a lot and so his average 3-day polling is usually quite a bit different from other polls. I wonder if he screws around with the demographic weights in his polling every day or if he sticks with one methodology.
The only poll of his worth watching is in SC. I think he's got it about right, although Edwards is ahead by more than a point. However, if Kerry continues to poll ahead of Edwards as he did last night, then I think Zogby may have picked up on a trend that will help win the state for Kerry.
In my opinion, with whites pretty well set on Edwards, black undecided (who outnumber white undecided 2-1 in most polls) could very well decide whether this nomination fight ends on Tuesday or goes another couple weeks. The trend is black voters prefer Kerry, and any bump in the final days for Sharpton will likely be at Edwards expense. You just can't call it when there are 20% undecided black voters IMO. If a quarter of black voters are undecided that's about 10% of the total who will vote on Tuesday - and that is the margin Edwards now leads by in most other polls.
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