Dianne Feinstein is nothing if not a staunch left-winger. Yes, every now and then she might express an idea that the radical base is uncomfortable with but, by and large, she toes the Democrat line. Still, she has a problem. "Toeing the line" is no longer good enough.
These days, if you want the support of the Democrat party, you must parrot every, single, crackpot position - no matter how utterly insane you sound doing it - and you must do so with 100% conviction. You need to spout their platitudes at the top of your lungs from the highest rooftop. There is no stance too far to the left, no opinion too radical. If anything they want you to say makes you uncomfortable, tough. Shut up and say it. Fail to meet this standard and you're out.