This allows you to vote for either option, but not after you've already voted. It does not allow you to vote again, even if you restart the project. Press See Inside to see the code. You can use this in any project by replacing the cloud variable changed with whichever variable corresponds to the votes for a button. This is the simplest implementation I could come up with. It is good enough for simple projects.
thanks to @pizzafox20109 this would not be possible with out pizzafox20109
