The Senate rules regarding the conduct of an impeachment trial, including ballot secrecy, require a simple majority (though a two-thirds majority is required for conviction).
Donald Trump should be convicted unanimously by secret ballot | TheHill
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a regular jury has a secret vote.
I hope you are just trolling...
But if not, that means you believe the federal government has the right to make domestic decisions regarding who gets to vote for who without the electorate knowing....
And that is really scary shit.
You may want to reconsider.