Was the Donald Trump campaign involved in the DNC hack and can it be said that it changed the outcome of the election.
The DNC hack didn't had any impact on the elections. Some of the Sanders voters refused to vote for Hillary, but almost all of them had made up their mind even before the hacks. Actually, it was James Comey of the FBI who did the most damage for Hillary.
Well in the USA though elections pass honestly, in a difference from many former soviet union countries. Where self concept honesty is absent from old times.