According to TVByTheNumbers.com, CNN's 8 PM ET program garnered only 322,000 households on Tuesday night. Nancy Grace on HLN had a higher household cume in the 35-64 demographic (366,000) in the same timeslot.
http://tvbythenumbers.com/2010/04/21/cable-news-ratings-for-tuesday-april-20-2010/49360
http://tvbythenumbers.com/2010/04/21/cable-news-ratings-for-tuesday-april-20-2010/49360