It'd be bad because I want the news, I don't care who is giving it to me as long as its accurate and up to date. In fact I think media personalities are bad for the news.

David Frost, while not American, has had a show on Al Jazeera English since 2006:

http://english.aljazeera.net/programmes/frostovertheworld/

Like Anderson Cooper: http://twitter.com/andersoncooper/status/31518264634900480