Not Biden's wife, Obama's campaign. They are the one's who blacklisted the station.
The campaign official said that it was unlikely that there would be any future interviews with that station for the duration of the campaign. That's barely a week & it was unlikely to get anymore anyway because America is a big place if you didn't know.
What chance does any station have of a Palin interview? Are they blacklisting the whole country?
Just remember all this when a few weeks into the presidency they get questions they don't like and you see a similar response.