Gallup: Survey Methods, Complex and Ever Evolving

… For our final month of political surveys before the Nov. 6 election, we are now conducting a separate daily tracking program consisting of interviews with a random sample of 500 U.S. adults each night. …

As has always been the case, we do not attempt to weight the composition of the likely voter sample in any way — such as by political party or race or age — to approximate some guess of what we or others think it should look like demographically on Election Day. That approach is precarious given that the electorate can look quite different (especially looking at political parties) from one election to the next. [cont.]

Frank Newport, Gallup