If you heard this quote without knowing who said it, you would think it is most likely that the speaker meant “vote again for me”. When a politician says “go vote”, it’s normally implied “go vote for me”.
In context, I think it is obvious that is what Trump meant. People that have been told Trump is a dictator that wants to end democracy obviously won’t approach that quote with normal grace they afford others.
Lets say you are right and the correct interpretation is:
"and if everything goes well, maybe you won't need to vote for me again"
Trump would be term limited, so they would not be able to vote him in as president again anyway. That is why this interpretation does not make sense to me.
It would just be a useful reminder of that fact. Remember: you're trying to sell voting to someone who doesn't normally vote. It's easier to sell it as being a one-off thing versus sell them on voting in all future elections.
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If one heard this quote without knowing who said it, they would think it is most likely that the speaker meant "If I win, I will make sure further consent of the governed, unnecessary", which is why the quote got the attention it did, and why, to my knowledge, no other US presidential candidate in the entire history of our nation has ever dared utter it.