When MSNBC legal analyst Mimi Rocah said that Bernie Sanders “made [her] skin crawl,” though she “can’t even identify for you what exactly it is,” she was just expressing more overtly the anti-Sanders bias that pervades the network.

The hostility is so entrenched, in fact, it seems to have corrupted MSNBC’s mathematical reasoning and created a new system of arithmetic. The cable news network has repeatedly made on-air and online mistakes about Sanders’s polling and other numbers — always to his detriment, and never with any official correction.

Here are some new rules MSNBC seems to follow when it comes to math and Bernie Sanders.