Done for LCV. Not in RCP. Don't care
RCP is a rightwing publication, they've even admitted that themselves (look at Wikipedia and many other places for proof), and even in their polling database there are polls that are suspiciously not included as well as they're being really random with which polls they prefer to include in their polling average and which not. If they had been more consistent, it would have been easier to take them more seriously. On some races, like Kansas, they've continously tried to paint a more favorable picture for GOP than everyone else have already agreed upon is the situation on the ground there.
Yeah, I actually talked to the one Democrat who works (or worked) for them a couple of years back. Poor guy.