Negative painting works [View all]
Ask Mike Dukakis and his "running mate" Willie Horton, Al Gore "the inventor of the internet", or "swiftboated" John Kerry. Each was unfairly painted by the opposition. But Hillary Clinton faced far worse, because she actually faced the power of political witch hunting in Congress.
One lesson to never forget is that negative painting works very well indeed. Hillary Clinton's trust rating were destroyed by the GOP investigations and then by Comey and FBI investigations. Take a look at the graphic by mid 2015 she was in deep trouble.

(this graphic is from July)
Her trust rating was even lower (about 36%) when Comey struck two weeks before the election. The only reason she was leading the polls, was because Trump, a historically awful candidate, had an even lower trust rating. But then there was very little that could be done about Comey, he threw the election to Trump.
ps---I personally know of people who usually vote Democratic, who left their ballot blank for President and who could not be convinced to vote for Clinton. Very sad.