From CNN's release:

Throughout a record-breaking year for CNN, more viewers in the 25-54 demographic turned to CNN during the 5 p.m. hour than to any other cable news channel. Additionally, The Situation Room with Wolf Blitzer, from 4 p.m. to 7 p.m., was No. 1 among 18-34 and 18-49 viewers in 2008.

For the three hour block, The Situation Room attracted, on average, 81,000 viewers in the 18-34 demo, as compared to the 61,000 viewers who turned to Fox News and the 53,000 viewers who turned to MSNBC. In the 18-49 demo, an average 219,000 viewers watched The Situation Room versus 209,000 and 129,000 who turned to Fox News and MSNBC, respectively.

At 5 p.m., The Situation Room averaged 245,000 viewers in the 25-54 demographic, compared to the 243,000 for Fox News' Election Headquarters and 197,000 for MSNBC's Hardball. According to Nielsen data for the year, The Situation Room also beat its competitors in the 5 p.m. hour in the 18-49 demo with 213,000 viewers, versus Fox News' 190,000 and MSNBC's 146,000, as well as in the 18-34 demo with 77,000 viewers, compared with Fox News' 57,000 and MSNBC's 58,000.