So, there is no good reason for the pages and pages of videos that proport to compare Warren and Sanders, but really are varying degrees of mud slinging, against one of the better candidates, that you've posted? I don't recall a single one you've posted slinging mud at Biden, or any other candidate. Now, considering there are other candidates that are women, then it would indicate, your real issue is that Warren is the best chance against Sanders, and so instead of actually pointing out all the reasons why Bernie would be a good choice, you're too busy focusing on attacking another candidate.
This is where I'm going to mention why I've not voted for a member of the GOP on anything past the local level, in about 25 years. Its because I do not vote for mudslingers. The only thing in Bernie's defense here is, all the mudslingers seem to be people like you, and not anyone in his campaign.