538 says of the recent Quinnipiac Iowa and Colorado Senate polls:
http://fivethirtyeight.com/datalab/senate-update-optimistic-numbers-for-gop-in-colorado-and-iowa/Additionally, when Quinnipiac polled the Colorado Senate race in mid-July and found the race at Gardner +1, they had Latino voters as 13% of the voter sample. The partisan breakdown was 29% R / 27% D, which seems plausible.
http://www.quinnipiac.edu/images/polling/co/co07162014_demos_Cy429pb.pdfIn this most recent poll with with Gardner up +8, Quinnipiac only included Latino voters as 8% of the sample. So in the last two months, they have decided that the Latino share of the electorate will drop by about 38%! And as others have mentioned, this poll is weighted at 34% R / 27% D.
http://www.quinnipiac.edu/images/polling/co/co09172014_demos_czm75h.pdfI don't know the reason for these changes, but the current poll's sample has been shifted to be extremely GOP friendly. No wonder Hickenlooper and Udall did so poorly.
