Can my employer legally not allow me to leave work to vote?

well to make it easier you should just phone your elections office and request an absentee ballot. They will mail you a ballot and you can fill it out and send it back to them. If you would rather go to the voting booths you can early vote. In some states early voting has already started. Just call the elections office and see when amd where you can early vote. You can also do these things by going to their website,