The combined overall household rating for Tuesday night’s second presidential debate, in 55 of the 56 local television markets where Nielsen maintains electronic TV meters, was 42.1.
In comparison, the first debate between Senators McCain and Obama received a much lower household rating (34.7) in the top 55 local TV markets.  Last week’s V.P. debate received a 45.0 household rating in the top 55 markets.
One rating point equals 1% of the total TV audience in a given market.
The Nashville market, where the debate was held, had the largest TV audience, with a household rating of 59.2, while the Sacramento/Stockton/Modesto, California market had …