"Warren Says Sanders Told Her a Woman Could Not Win the Presidency"
You've seen this story, I'm sure.
I think, even if it were true, that there's likely less there than meets the eye. It's a statement
taken out of context. We don't know any of the details of the conversation. It could have been an offhand comment concerning the tactics of the Trump campaign and the mood of the electorate. I'm not a Sanders-worshiper by any means, but I respect him and I find it very hard to believe that he meant this as blanket statement to apply for all time.
But I wasn't there.
As to the damage the impeachment hearings might do to the candidates, I don't know if that's the case. None of the competing senators are particularly charismatic. They could get stand-ins to address campaign rallies and double down on media advertising. And the way they conduct themselves at the trial could make for positive coverage.