Clinton's descent into ignominy is somewhat harder to explain. Five years ago, according to Gallup, Clinton while serving as President Obama's Secretary of State had a favorable rating of 66 percent and an unfavorable rating of 31 percent. The number was just one point off her all-time high of 67 percent achieved during the impeachment proceedings against her husband in 1998 (Americans apparently deeply sympathize with the aggrieved spouse).
While Secretary of State, Clinton emerged as a cool internet meme as "Texts From Hillary," featuring the politician in shades on a government plane looking at her phone, became a global phenomena. Clinton at the time was the cool-under-pressure diplomat who turned a crushing loss in the 2008 primary into a strong stint serving under the man who beat her.
And then the Benghazi attack happened in Libya in September of 2012 and Clinton's numbers began a downward trend that continues to this day. From the outset, the administration's handling of Benghazi angered many Americans. First it was a spontaneous event sparked by an internet video. But in fact it turned out to be a coordinated, planned attack.
Some observers point to Clinton hatred as pure misogyny, and surely there is a bit of that. But while a GOP House Committee found no wrongdoing by the Obama administration on Benghazi, a narrative began to take hold on the right that Clinton was a liar with the blood of Americans on her hands. That is still the biggest attack leveled against Clinton on Twitter even by Republicans who might despise Trump but hate Clinton even more.
There are other elements to Clinton's crash. She has been relentlessly attacked on the left by Bernie Sanders, who portrays her as a shill for Wall Street and other corporate interests. Stories continue to pop up on the seamy operations of the Clinton Foundation. And Trump is now dredging up the scandals of the 1990s to slime Clinton over the actions — both alleged and documented — of her husband.