RCP is "diverse" compared to CNN or Fox offering opinions from center (mayyybe center -left) Bloomberg/Politico/NYMag to far right (Federalist), with a clear Right bias. Their founding mission to provide diversity to balance the Liberal Mainstream Media. They have nothing Left like Mother Jones or Jacobin.

The farthest left they go is in linking to Biden endorsements, but Biden is a centrist establish Democrat who has been endorsed by most of the pre-2016 Republican party.

It's obvious from the list of sources: https://www.realclearpolitics.com/