It's not just ERA. Mass media (usually bribed or funded by corporate interests) has it out for him. big business fears someone even slightly not in their thrall. Why do you think the capitalist Warren gets propped up so much
I'm in this thread defending Sanders' choice to reveal or not reveal what he wants in regard to his health -- it's his health, it's his business, it's ridiculous to say he's "lied about sharing his medical history" -- but if you think that there is some "mass media" effort to "prop up Warren" that is "out to get Sanders," you're being delusional.
Beyond that, Warren has as admirable a record going after big business as Sanders does. She was the architect of the Consumer Financial Protection Bureau, and she's been a stalwart advocate for consumer rights and individual protection against corporate power since being elected to the Senate.