David Muir's ABC News program has consistently been No. 1 in total viewers for 16 of the past 19 weeks. But last week, Muir was No. 1 for the first time in the all-important 18-49 demo and the news demo of 25-54. This marks the first time that a news program topped both demo numbers in at least 28 years.
TOPICS: David Muir, ABC, World News Tonight, ABC News, Ratings