She didn’t make a mistake, she deliberately went to great lengths to break the law.
The Clintons always minimize their criminal actions as trivial, mistakes, etc... when they are clearly intentional acts to subvert the consequences of the public knowing what they are actually doing. Of course now it is clear there are no consequences - at least for a Clinton.
What “mistake” will she make if elected? Guarantee there will be “mistakes” - that is her sorry history.
While Trump was not my first choice, he is the only reasonable alternative and I will do all I can to help him and avoid the sure dictatorship of Mrs. Clinton.