There's enough blame for everybody to go around, with evidence:
-Clinton campaign for ignoring the rust belt and betting everything on high turnout for Latinos, Blacks and Women. All three were down compared to Obama afaik, but also the White vote (particularly in Rust Belt area).
-Hillary Clinton herself for her chronic need for secrecy, and some stupid choices (email server being one, but also a few others)
-Bill Clinton for stupid shaddy appearances Trump could latch on (e.g. meeting with AG on tarmac), also saying stupid stuff about the ACA.
- Bernie Sanders for whipping his crowd into a frenzy about Wall Street and Corruption, some of them becoming never Hillary's
- Minorities, Youth and Women voters for not turning out more in spite of facing probably the worst candidate in the history of this country with Trump
- Comey/ FBI for intervening in a crucial election for no good reason, trashing the FBI's reputation in the process
- Wikileaks for being puppets of Russia and interfering in the US election, selectively releasing hacked emails targeting one campaign
- DNC for picking a side in a supposedly democratic process. They didn't even have to do that, they set the rules and then were all shaddy about it, reinforcing Clinton's appearance of corruption in the process
- Third parties, obviously serving as a "principled escape hatch" for ex-Bernie's, Stein in particular.
- The News TV Media for giving Trump, being so entertaining and good for ratings, a free platform he could run on. Himself or his surrogates constantly lying with impunity, rarely challenged with facts, including with the debates. Also latching on emails like rabid dogs, in spite of being no there-there.
- The more liberal media (press in particular) for ignoring / dismissing Trump from the get go, treating him as a joke, and often dismissing his electorate or not trying to analyze why they would vote for him too (besides a racist/ xenophobic core existing which I estimate at about 20%).
- Pollsters for having totally failed at accurately represent the real white anger wave that was growing in the more rural areas, and just how much that would play in Mi/ Wi/ Pa and even Oh to some extent (they did predict that last one, just not how big).
- Latinos. 30% for Trump? Un-believable.
But on top of that, as much as I hate the Orange Terrible, I'm going to have to admit that he ran a very smart campaign, and whoever decided to target the Rust Belt was a genius.
He lost all 3 debates by most measures, insulted and demeaned a large swath of people based on gender, race, disability or simply having slighted him.
He is on record with extremely racist actions and words, boasting of sexually assaulting women, cheating on his wife, has been accused of multiple counts of alleged rape, is sued for fraud, and the list goes on ... and he wins the office.
So... "Respect" for playing the system (and the people).. if nothing else?