Media bias?

When Obama-cheerleader Chris Matthews interviewed Biden-cheerleader Jay Carney during primary season and before the election, shouldn't NBC's Matthews have disclosed his interest in the Pennsylvania Democratic senate nomination, and shouldn't Time's Washington bureau chief Carney have disclosed his interest in going to work for Biden as director of communications?
http://thepage.time.com/2008/12/15/biden-time/

If Hillary were the Democratic nominee, or anyone other than Biden the vice president, would either of them have any chance of getting these jobs? Aren't there media rules regarding conflicts of interest?