On Tuesday night, 69.9 million viewers tuned in to watch the sole vice presidential debate between Joe Biden and Sarah Palin.
The Biden-Palin matchup set a new V.P. debate TV audience record, beating the previous high of 56.7 million viewers set by the debate between Rep. Geraldine Ferraro and then-V.P. George H.W. Bush in 1984*. 
Biden and Palin’s debate also surpassed the first presidential debate between Barack Obama and John McCain, which drew an audience of 52.4 million last Friday night.
During the last presidential election in 2004, the vice presidential debate between V.P. Dick Cheney and Sen. …

The combined overall household rating for Thursday night’s vice presidential debate, in 55 of the 56 local television markets where Nielsen maintains electronic TV meters, was 45.0.
One rating point equals 1% of the total TV audience in a given market.
The Baltimore market had the largest TV audience, with a household rating of 59.1, while the Los Angeles market had the lowest household rating: 34.4.