ABC's David Muir fights back in TV-news battle with NBC's Lester Holt
David Muir's ABC newscast wins first May sweeps in 8 years
David Muir, Lester Holt in see-saw battle for evening-news viewers
ABC News President David Westin: 'The Right Time' to Leave
Diane Sawyer as ABC News Anchor: The Reviews Are In
George Stephanopoulos to co-host Good Morning America: A bad move?
Why Charles Gibson's retirement boosts Brian Williams
Charles Gibson retires at ABC; Diane Sawyer is new anchor