I had treads on this but no one could find the sample sizes of the polls
of republicans, democrats and independents
Poll Madness: McCain Takes Lead Even As Democrats Out-Register Republicans?This week's mainstream coverage of the presidential horse-race has been dominated by a series of polls showing the McCain-Palin ticket with its first stable lead over Obama and Biden. Gallup's tracking poll, USA Today and CBS News all show the Republicans with some kind of lead over the Democratic ticket. But, interestingly, all three polls were also conducted using a higher sampling of Republican voters than in July, thus raising a question of methodology.
In a year in which Democrats have a lead of 11 million registered-voters over Republicans, and have been adding to that advantage through a robust field operation, are pollsters over-sampling Republicans
Despite a raft of advantages in the electorate for Democrats, in September's first Gallup Tracking poll, an equal number of Republicans and Democrats were surveyed (including "leaners") from Sept. 3-5, compared to a 10-point Democratic identification advantage two weeks ago. That partisan makeup of the polling pool resulted in a 5-point lead for McCain in Sept. 5 tracking poll. Meanwhile, the new CBS poll features a 6-point swing in partisan composition toward Republicans, which plays some role in the poll's two-point lead for McCain. Finally, the latest USA Today poll, which claims a four-point edge for McCain, was arrived at after a 10-point swing in partisan makeup toward GOP respondents.
Some polling experts say the changing state of party affiliation in the field is slow to be reflected in polls themselves. Democratic pollster Anna Greenberg told the Huffington Post that "when it comes to registration and turnout, the polls often do a very bad job of taking those
into account," because newly registered voters aren't in the voter files used by firms that survey public opinion. "You could make the argument they are under-representing new registrants," she said, which would mean that the Democrats new edge would not be taken into account.
Monday's USA Today poll had a 48-47 split between Democrats and Republicans surveyed. That represents a nearly 10 point shift in party identification toward Republicans since USA Today's July polling. When asked for comment, USA Today polling editor Jim Norman wrote that "it's possible" that their latest sample includes too many Republicans. Though he added, "it's also possible that we have too many Democrats," because "there's always the chance of an over- or under-representation" in polls.
Still, Norman admitted that the GOP identification in the latest survey has spiked. "The party ID in our most recent poll does show a shift away from what Gallup has been getting in earlier polls, going all the way back to 2005," Norman said. "But previous conventions -- the Republican one in 1988, the Democratic one in 1992, the Democratic one in 2000 -- have also shown shifts in party ID toward the party that had the convention, and those shifts seemed to last, to greater or lesser degrees, though the election. Further, I've been told by Gallup that their tracking poll has shown a similar shift in party ID since the Republican convention. ... I guarantee you we will be watching closely in all of our polls between now and election day to see whether there are further shifts in party ID in either direction."
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http://www.huffingtonpost.com/2008/09/09/poll-madness-mccain-takes_n_125158.html
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