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[Tyrone Slothrop]

A further post from Ruy Texeira addresses the point Bilmore made:

• How is it possible for samples of RVs to suddenly have too many Republican identifiers? Aren't voters just shifting their party identification?
  
  It is certainly possible that we gone from, say, a 4-5 point Democrtic lead in party ID to a 4-5 point Republican lead in the space of the last month. But color me skeptical about this 8-10 point swing in a few short weeks.
  
  A better explanation for this sudden shift in poll samples, in my view, is that when the political situation jazzes up supporters of one party, they are more likely to want to participate in a public opinion telephone poll and express their views. An increased rate of interview acceptance by that party’s supporters would then skew the sample toward that party without the underlying distribution having changed very much, if at all.
  
  In this case, the Republican convention, coming on the heels of the Swift Boat controversy, may have helped raise political enthusiasm among Republican partisans, leading to more interview acceptances and a disproportionate number of Republicans in recent samples.
  
  Do I know this for sure? No, I don't, because we lack direct evidence that this is happening, just as we lack direct evidence that individual voters are suddenly and massively shifting their party allegiance. But I do know which of these explanations I find more plausible and consistent with other evidence about the general stability of party ID.