CBS Evening News Videos 2004 to present
Democracy Now! Coverage from the late 1990s to now. Not all dates are online, but full episodes are available for free.
FOXNews Video Some 2008 to present.
PBS Online NewsHour 2000-present.
YouTube - News. Includes AP broadcast news clips as well as network affiliates and press associations. Current.
(From the UNC Television News Libguide)