The page keeps timing out, so I can't read the whole article, but based on the excerpt posted here, it's sounds pretty accurate.
The ones who are really stabbing us in the back are the doofus kids who think we can win the Republican nomination by screaming at people, peppering our speech with leftist slogans, and refusing to engage with actual Republican voters.
If you want to win, ditch the Che Guevara t-shirt, put on a tie, and go meet the members of your local Republican Party.
qft