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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

Another light week of polling over the long holiday weekend means only one change to the Senate map. Pennsylvania moves from toss-up to lean GOP as new polls show Pat Toomey (R) pulling ahead of Joe Sestak (D). This marks the third consecutive week Republicans have gained a seat, putting them up to 45, with Democrats steady at 49 seats, and 6 seats still classified as toss-ups.
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