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If this were presented as a High School paper I'd fail it for lack of research.
Your main point is irrelevent, because you have a Constitutional right to vote, it's even supported by Court Cases.
What you don't have is the specific right to vote for Electors. That's because in this case the Constitution specfically grants to States the ability to chose how the Electors are chosen. The State can have a vote, a lottery, have their Governor pick, it doesn't matter.
In all cases outside Presidential elections you have a Constitutional right to vote for Federal offices and have for a hundred years. Voting for the Senate used to not be a Constitutional right.