HIllary was a bad candidate on so many grounds:
1) Looks - they matter, there are numerous studies showing that looks for women and also height for men is correlated with earnings. Hillary was a dumpy woman (who looked like she never saw the inside of a gym) who lacked the edge of a Kathy Bates or Margaret Thatcher.
2) Tone - she was not a dynamic speaker, and she didn't have the ability to think on her feet, everything was rehearsed and came out that way.
3) Knowledge - for a so-called "policy wonk" she had no understanding of economics and business (very normal for lawyers from top schools), this was evident to me in the debates when she reversed herself on trade, looking for the politically right answer because she never really understood the issue - which was while trade made the country richer, some groups were left behind - had she responded by admitting she missed it, and that her administration would ensure that everyone would benefit from trade, constrasting her with the Republicans who cut the programs that would have helped the ones left behind (unemployment, health care, education and retraining). She also should have pointed out that 4 of 5 manufacturing jobs were lost to automation, not trade, and trade barriers won't bring them back, just cause us to lose more jobs. But I think Hillary really didn't understand economic issues, she was more comfortable with "rights" issues.
4) Pandering - Hillary focused on identity politics instead of on bread and butter issues, and of course, if the focus is on identity politics, white people don't have to be racist to see that everyone will get something from a Hillary administration but them. Most white people aren't part of the top 1% (or 5%), most aren't descended from slave owners (the Irish got here too late after the famine, as well as the Eastern and Southern Europeans in the 1880s to 1920s) or are card carrying members of the KKK, but when you force them to identify as white, and attack their "white privilege" (which really appeals to the guy who just got laid off!), why are you surprised when they vote "white" instead of "working class" or "American."
5) Attack ads - a month away from the election, we were all flooded with anti-Trump ads, instead of issue oriented ads designed to sell Hillary to middle America, she doubled down on more attacks ads. There was "Trump fatigue" after a while, because people know what they thought they were getting with Trump. Can anyone remember what Hillary was for, other than the vacuous "families?"
6) Bad Behavior - first the server, then the amateur hour people who set up the server (so you're running for President, you don't bring in a lawyer and a professional IT firm to make sure you've covered your ass?), a bad combination of paranoia and penny pinching. The speeches in which she tried to out Romney Romney with her two sided approach (uh, Hillary, the days when you can tailor messages and not have them bleed over and go public are long gone), the greed and stupidy of the Clinton foundation (ironically, it was more about ego, the Foundation was far more legitimate than Trump's bogus charity, and did a lot of good work, but sometimes less is more, and a lot of donors should have been rejected), Bill giving talks for money far too close to the election, Bill talking to Lynch on that plane.
7) Echo chamber - Hillary left Illinois far behind when she went to Yale, and in Arkansas, she made no attempt to fit in or understand the people in her new home. Much like Al Gore, who fled Tennessee for Washington, and lost the election because he lost his father's common touch, Hillary fled to NY where she could hobnob with wealthy donors and like minded liberals and avoid "flyover America" until it was too late. If you don't interact with middle Americans, how are you going to develop the instincts needed to communicate with them?
The Russian hacking and Comey may have impacted the election, but Hillary did a fine job melting down on her own.
If Biden isn't sidelined by grief, I think he rolls Hillary in the primaries and Trump in the general election.
Biden can match Trump for plain talking, but he's also a decent human being and that would have resonated with America.