On today's Op Ed page, the Albuquerque Journal runs a piece by Lawrence J. Korb, a former Defense Department official. At the bottom, the Journal identifies Korb several ways. For one, the newspaper tells us, he's a senior fellow with the "American Progress Action Fund, a liberal think tank in Washington..."
That identification is helpful to readers, I think, and the Journal ought to be complimented on it.
Of course, for each article from a liberal group or individual that the Journal publishes, it runs several from right-of-center sources. I presume the newspaper will proceed to identify those sources, including the CATO Institute, Heritage and Heartland, as "libertarian" or "conservative."