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The advantage in the Giuliani-Clinton match-up has snapped back and forth like a ping-pong ball all year long. Only once since November has either candidate reached 50% support: Giuliani, in February, when he led 52% to 43%. Neither candidate has fallen below 40% support. On several occasions—most recently in June and July, for three polls in a row—Clinton and Giuliani have been just a point apart, or tied.
Individual polls can sometimes overstate volatility in a race, especially when the results carry a four percentage point margin of sampling error. One way of addressing this is to look at a rolling-average of three consecutive polls. Using this approach, Clinton and Giuliani have both been within two points of the 45% mark for twelve consecutive polls dating back to May 1, 2007. The candidates have been within two points of each other on seven of those twelve surveys.
Still, while the candidates have hovered consistently around that 45% level of support, a trend in Clinton’s favor can easily be detected. During the first eight sets of three-poll averages, Giuliani was “ahead” in seven and tied with Clinton in the eighth. Clinton has held the advantage in the last four updates of the three poll rolling average. She currently leads 47% to 43%.
It’s worth noting that on individual polls with a four point margin of sampling error, Giuliani has been within four points of the 45% mark for fourteen consecutive surveys dating back to March. Clinton has been within four points of the 45% mark on eighteen of nineteen surveys dating back to December.
But I have made a decision for the month of Dec & Jan, I think I am going to pay for subscriptions for some of these polls so I can look at the crosstabs and other goodies.
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