If you submit another vote you will effectively null your first vote. Only the most recent command is counted toward the results.
This is a command for voting for #29 and #2 on the command line:
execute vote Splash_Screen 29.GalacticReoTrayan;2.GalacticReoTrayan;
Note that the command is deliminated with spaces but your answer is after the 3rd space and this is deliminated with a ";" and there are no spaces in the answer choices. Your answer is stored in the blockchain as a string. Answers have to replace spaces with "_" because of the limitations in the command line and a delimiter is needed (which can't be a space) so the wallet can discern when an answer ends and a new one begins, the current code uses the ";" as a delimiter for multiple choice votes.