He didn’t say a woman couldn’t win against Trump, he just said he would weaponize his misogyny. Why would Bernie encourage Warren to run in 2016 if he thought a woman couldn’t beat Trump? Why would he campaign for Hillary if he thought a woman stood no chance? He’s also obviously aware that Clinton won the popular vote against Trump. Maybe these were rogue campaign staff who leaked the story thinking it would help, but Warren’s lack of clarification or context showed her cards imo. Her campaign has made numerous dumb decisions and this is just another.