There should be some sort of indicator on the HRE button that tells you various things about the electors. Maybe a green exclamation mark can be by the button if an elector has started to vote for you, and a red one if you lose a vote. If your the heir to the empire maybe there is a blue dot by the button. If you're the Emperor and the heir the indicator will be a green dot. If you are the Emperor and not the heir you will see a red dot.
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