FOX had the top average demographic ratings (Adults 25 - 54) in all three time slots this week. Actually, they had the highest numbers in the demographics each day in all three time slots except for Monday, 10PM when CNN's Anderson Cooper 360 took the top spot and Thursday, 8PM when MSNBC's Rachel Maddow Show had the highest demographic rating of the time slot.
It should also be noted that MSNBC came in second in both the average demographic ratings for the week in the 9PM time slot and beat CNN four out of five nights.
CNN Headline News does very well in the percentage of Adults 25 - 54 compared to their total viewing audience. Nancy Grace at both 8PM and 10PM has had a 40%+ for each week in the month of September. This week 8PM was 40% and 10PM was 47%. Glenn Beck at 9PM had 38% of his viewers within the demographic and that is slightly down from 39% that he saw in the first two weeks of September. HLN may not always have the highest demographic or total audience numbers, but they tend to consistently draw a higher percent of Adults 25 - 54 viewers.
^ Courtesy Nielsen Media Research; Demographics where noted; Live + Same Day (LS) Fast Track Nationals.