Sounds like a pretty petty complaint
Is it really surprising that for one day when a Republican president was inaugurated, there would be more Republican than Democrat guests on the news coverage? Likewise, when a Democrat is inaugurated president, is it unexpected that on that one day, more Democrats than Republicans are interviewed? Really, are Democrats becoming such pitiful whinners that they can't tolerate a single day where they don't get the majority of media face time?
As for the major networks, it's what happens all the other days of an administration that constitute bias. Look at the selection of news stories they cover and the time they give for Republican verses Democrat discussion on those stories. It isn't hard to see the pattern.