"Remember, though, that these state polls are a lagging indicator and most do not include any surveying done after the vice-presidential debate on Thursday night. According to Nielsen Media Research, debate was the most heavily-watched since 1992, with nearly 70 million Americans tuning in. That’s 18 million more viewers than the first presidential debate, although the fact that the Obama-McCain contest was held on a Friday undoubtedly cost it some viewers. Polls by the middle of next week should tell us more about what impact, if any, the VP debate had on the race."