It doesn't mean anything if a percentage of NPR News employees are "Democrats." Up to and including the last election, DC had closed primaries. So does New York State. If an NPR employee wants to vote in a primary election, including elections for local offices, they have to register in one party or another. In many area, one party is dominant so that party's primary decides who wins a given office. If you want vote in a school board election, you better be registered in the dominant party. Registering for a party in a closed primary state is hardly political commitment or activism. Journalists do have opinions but they are trained not to let their opinions shape their reporting. If anything, journalists too often bend over backwards to be "fair" - often to the detriment of accuracy in reporting. Nixon got re-elected after Watergate because too many journalists were being "fair." Trump got elected the first time because too many journalists, including at "NPR" were busy striving for balance.