The vote resubmission flow actually should be working already, since things like the votes left are taken into consideration when enabling/disabling the vote button.
But we should show more clearly to the voter that it's about to resubmit a vote:
[ ] Change the "Vote" text in the vote button for something like "Overwrite vote (n left)".
[ ] Also show an alert/info on the questions form or over/below the button itself (whichever looks better).
The vote resubmission flow actually should be working already, since things like the votes left are taken into consideration when enabling/disabling the vote button.
But we should show more clearly to the voter that it's about to resubmit a vote: