WASHINGTON--Presidenti Barack Obama and Mitt Romney second debate Tuesday at Hofstra University on Long Island, drew 65.6 million viewers, according to Nielsen ratings. That's less than the 67.2 million who watched the first showdown in Denver.

The least viewed was the vice-presidential debate last week at Centre College in Danville, Ky.

According to Nielsen

Debate One
67.2 million viewers

Debate Two
65.6 million viewers