Yesterday I was wondering why James Carville was on Meet the Press as a pundit and not part of the Clinton campaign. Today the New York Times is wondering the same thing:

Both networks are careful about balance: there are equal numbers of
Republicans and Democrats. But they are careless about bias: the
experts are supposed to be impartial, but it is left to viewers to
parse their complicated pedigrees and entwined political obligations.
It’s not that they have nothing to say, it’s that what they say is not
accompanied by an asterisk.

Carville was suspended at CNN until after the primary because of his ties to the Clinton campaign. Also worth noting is that the rules for cable and fair time are not the same as they are for network broadcast. Meet the Press is not a cable show and has to follow a much stricter standard.