[music] tonight, a major shift in the guides in how to protect yourself through all this. the cdc now saying people should use cloth face coverings when going outside. this is voluntary. i don't think i'm gonna be doing it. i mean, if he's not wearing a mask, i'm not gonna wear a mask. if he's not worried, i'm not worried. -[reporter] the president? -yes, sir. we were a society primed for partisan polarization anywhere, on anything. and of course covid played into that dynamic.