Tim Ryan (D-OH 13th), who unsuccessfully challenged Nancy Pelosi for the leadership of the house Dems, said a similar thing, calling the Democratic party too factionalized.
The party needs to realize who it needs to speak to, and who that is for the most part should be America's working class. Had the party focused nearly solely on an economic message my guess is Clinton would have won, and probably won handily. No, not the phony economic message Trump tried to put forth (bringing back coal and steel jobs, preventing anyone from moving jobs to Mexico, Viet Nam or some other ultra low wage nation) but one of reality and appeal to all of us who work for a living.
Within the working class (and the true middle class) there are men and women, young and old, whites and blacks, gays and straights, Christians, Muslims, Jews and atheists, and people from just about any other belief or demographic out there, other than those born with a silver spoon in their mouths (which is how to describe virtually anyone who is extremely wealthy since few rich people were ever poor). Appeal to the working class and even those who are better off financially but progressive in their thinking and beliefs will likely support you.
You can also appeal to people of different demographics without alienating people of another one. Clinton failed miserably in that regard. One only needed to look at the campaign literature that many of us left with voters as we went door-to-door. Everything -- and I mean EVERYTHING -- I left behind on door knobs all over Northeastern Ohio was subtly designed to appeal to African Americans, the LGBT community, or some other tiny (usually) minority. Like it or not, it turned off a lot of people who are not part of those subsets of Americans. Hillary might not have been able to win the white male vote, but ameliorating some of the losses would have won states like Ohio or Michigan, and she made less effort at appealing to white men than any Democratic candidate in history. She wrote off people like me, despite the fact that I supported her (starting out of course as a Bernie supporter) and many others like me would have had the party made the proper efforts and assessments. You can appeal to a white working class middle aged male on Cleveland's west side without appealing to whatever racist tendencies you think he may have been raised under. And if he votes for you and you win, you can continue to fight for a more inclusive society and to eventually erase as much of the bigotry in America that you can. You can't do a go d d amn thing (politically) when you lose.
