Jura, Paddyanne.....too bad we haven't had more responses. A larger number might reveal similarities and patterns that would negate mere coincidences or paranoia. I agree that knowing electoral results ahead of time, is a huge red flag.
In Venezuela, it was voter intimidation.....Maduro's armed guards would brandish assault rifles and stand over voters while they filled their ballots. There were many other irregularities (destroyed ballots, bribery, forgeries) that were indicative of voter fraud.
In the US, it may have been overconfidence which is almost the same as knowing results ahead of time. There were repeated assurances that victory, was as good as a 'done deal'. The language and demeanor often surpassed what most would consider the usual hope and optimism.
It also appears that Russia had a hand in a relentlessly damaging campaign against the other presidential candidate. In subsequent investigations, much of it deliberately planted, was blatantly misleading or downright false.
It appears that elections/referendums may have become the 'weapon of choice' for those who aim to weaken a nation's sovereignty or destroy Democracy altogether!