In Michigan, where polls showed us ahead but not by as much as wed like, we had nearly 140 more staff on the ground than (President) Obama did in 2012, and spent 166 percent more on television, Clinton writes. I visited seven times during the general election."
https://www.detroitnews.com/story/news/politics/2017/09/14/happened-hillary-clinton-michigan-campaign/105619778/
This is one of the the things that is so mind numbing, blaming the victim in this case, but generally with Ds. They let themselves flake out over R BS, as they did with Joe here, Dean with the "scream,' etc.
She lost because this country is stupid as $hit, primarily, but if you have to put it on one thing, the fricken Comey letter.
"Clintons standing in the polls fell sharply. Shed led Trump by 5.9 percentage points in FiveThirtyEights popular vote projection at 12:01 a.m. on Oct. 28. A week later after polls had time to fully reflect the letter her lead had declined to 2.9 percentage points."
https://fivethirtyeight.com/features/the-comey-letter-probably-cost-clinton-the-election/#:~:text=Clinton's%20standing%20in%20the%20polls,declined%20to%202.9%20percentage%20points.