The TV audience for the senators' second meeting easily surpassed that of their first debate, which drew an audience of 52.4 million on Friday, Sept. 26.
During the previous presidential campaign, 46.7 million viewers tuned in for President Bush and John Kerry's second debate on Oct. 8, 2004.
See more historical debate ratings.
Viewership among Hispanic households grew by 34% -- from 8.2% of Hispanic households during the first McCain/Obama debate to 11% during the candidates' second debate Tuesday night.
Debate viewership among White (+21%) and African American (+9%) households also increased during the second presidential debate.
Coverage of the McCain-Obama debate was carried live on ABC, CBS, FOX, NBC, Telemundo, Univision, BBC-America, CNBC, CNN, FOX News Channel, and MSNBC from approximately 9pm to 10:30pm EST Tuesday night.
View the full media alert.