To that end as an outsider looking in, it seems to me that the biggest problem the democratic party has right now is the ability to openly discuss ideas in a rational manner free from the chains of political correctness and its inherent biases.
If the left could openly discuss the relationship between islam and terrorism, the negative impacts of certain equal opportunity laws on the minorities they are trying to benefit, the conflict between gender pronoun legislation and free speech, etc. then the party itself would be on big path for improvement.
Note: Your statements were about the Democratic Party so I gave you my opinion on it. The Republican Party is replete with its own flaws, but thats not the topic here. IMO I think most of the left/right dichotomy is a poor political model which leads to group think over rational contemplation of specific issues.
EDIT: I understand a libertarian or non-conforming opinion is not popular on HN or in liberal circles, hence the down votes. The irony here and specifically with my statement above is that we should uphold debate and argument over exclusion and political correctness to "let the good ideas win in free debate" and the only counter is to downvote and silence. Disagreement is great but it leads to Trump if you batle with intimidation tactics and silencing instead of actual argument. This is the biggest problem currently with many on the left and so I stand by my statement.