The release of the CNN/Time poll of registered voters, rather than likely voters, in several key Senate contests, including Kentucky's, continues to spark discussion.
The National Review's Jim Geraghty questions the CNN/Time poll, asking, "A little late for a registered voter poll, isn't it fellas?"
And here is more from Mark Blumenthal posted on Huffington Post and Pollster.com:
The "likely voters" identified by pollsters are typically a few points more Republican, as turnout is typically higher among Republican leaning demographic groups, those who are older, better educated and white. But, again, this year's gap -- at least in early national surveys -- appears to bigger than usual.
We are also seeing another pattern emerge that is mostly unique to 2010: In several states, pollsters using automated methods, particularly Rasmussen Reports, SurveyUSA and Public Policy Polling (PPP), are reporting results consistently more favorable to Republican candidates than those using live interviewers.