RCP: Even though the poll was scientifcally performed, it's a Democratic pollster--so we won't include it in our averages. We don't want bias.
Once again, I don't understand the dislike on here for Real Clear Politics. But I digress.
People just want a clean aggregate. 538 is better now since they launched their polling averages page, but RCP will quite often include R pollsters but not include D pollsters. They literally included the OANN Gravis polls but wouldn't add Morning Consult or PPP polls, amongst others.
Not only that, they won't even reveal what their criteria actually are for including polls in the aggregate (people like Harry Enten and Nate Cohn have tried to find out from RCP). This says to me that the criteria are arbitrary and subjective. No, thanks.
They're also not including polls from pollsters they were including in their 2016 average 6 like Reuters/Ipsos and USC Dornslife. It's very disappointing how often it's still used as a go-to aggregate for more casual followers.
