I think "hacking" is the wrong term for making Democratic National Committee internal documents public.

The "hackers" did not manipulate actual election voting results. It sounds like the so-called hackers simply added an additional level of transparency to assist voters in rejecting the Democrats. They delivered information that supported a consensus that the Democrats were untrustworthy and self-serving.

If the NY Times had leaked this information, it might have been considered a "scoop".

Also, I believe that most of the voters who supported Trump could not care less about the Democrats internal memos. Their decisions were based more fundamental issues and thie effect on their personal lives: jobs, immigration, the economy.