This information is date 2004.
It is comprehensive, however, and therefore worthy of consideration.
While methodologies might change a bit, they often don't change that much.
Additionally, and most importantly, this points out that "Likely Voters" in one poll is NOT the same as "Likely Voters" in another poll.
Pollster’s
apostrophe in wrong place
so, the pollsters think they are as good at determing who is and is not a likely voter, as Bernanke and his financial gurus are at guiding the economy, or as bank regulators were at predicting the 2008 financial crisis
the fact is in any “prediction” the more complex your formula is the more prone it is to be incorrect
None of this matters if the people are not honest when polled. Many people probably say they are likely to vote or lie about being registered or voting in the past, who will not turn up at the election site in November.
Wisconsin election chief hopes for post-Nov. voter ID ruling
By
MADISON, Wis. — Wisconsin’s elections chief says a state Supreme Court ruling on voter ID before Nov. 6 wouldn’t provide enough time to get ready for the change at the polls.
Government Accountability Board director Kevin Kennedy says if the court were to reinstate the voter ID law, people might not have adequate time to obtain the proper identification. The law has been blocked by challenges in two cases.
http://www.dailyherald.com/article/20120913/news/709139888/print/