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Methodology

For each state, the map uses the average of all public telephone polls (internet polls are not included in the average) taken within 14 days of the map's release date (all polls earlier than that will drop off). For example, the map published on October 15 does not include any poll earlier than October 1, except if the latest poll in a state was conducted before that date (for example, the most recent poll in Vermont was taken on August 31). States within a three-point lead for the Republican or Democratic candidate are classified as toss-ups; states between a five-to-eight-point lead for the Republican or Democratic candidate are classified as "lean" for that candidate; states outside the eight-point lead are allocated to the respective party. Please note: for some states, the most recent polls available at this time are up to one year old and other states with no polling yet available have been classified Republican or Democrat based on their 2008 results.

Election 2010: State of the Race

Monday?s announcement by Democratic Rep. Bart Gordon (TN-6) that he will not seek re-election marked the seventh Democratic member to retire from a competitive House seat.[1] As the Washington Post wrote, Democratic Party officials and strategists are concerned the seven just may be the ?leading edge of a wave? of retirements.[2] By comparison, only three Republicans from competitive districts[3] have announced their retirements. What does history tell us about the effect of the number of retiring incumbents on the majority party?s electoral chances?
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