David Muir replacing Diane Sawyer at ABC's 'World News'

  • by: DAVID BAUDER , Associated Press
  • Updated: June 25, 2014 - 1:40 PM

NEW YORK — ABC News is making a generational change at the top of its evening newscast, replacing Diane Sawyer with 40-year-old understudy David Muir in an attempt to take a run at longtime ratings leader Brian Williams at NBC's "Nightly News."

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