I think Hillary lost for playing the middle, amongst other things. Her lack of progressive vision and charisma is why she lost to Obama in 08. He got four million more people to vote for him in 2008 than she did in 2016. It also had a lot to do with the scandal attack machine. But I think Dems need to be more aggressive about being progressive, to motivate the nearly 50% of Americans that don't bother to vote.