Not the sole reason but I think her character, as well as the widespread dislike for her and what she is seen to symbolise, are often underplayed by DEMs.
And it suits them - it's not us, it's the Russians.
And what has been proven? Trump's crowd met with the Russians a lot of times, and might possibly have juicy Kompromat on him, thus giving them leverage on him - if he won.
Little or no evidence that I have seen of what was released that was untrue or false. They probably selectively leaked just material damaging to Clinton but that's not a great defence.