There are so many clues that Hillary is a sociopath. Just look at her treatment of Secret Service agents while she was first lady in the White House. She was constantly ragging on them, swearing at them. Soon as the cameras are turned on her, she pretends to be ever so sweet. She is very unbalanced, prone to drunken bouts and has emotional swings. And that's just a glimpse of her rotten character.
Hillary lies like a sociopath. This is a common trait among sociopaths.