Back in the early days of voting in America. It was often a very intoxicating affair. In fact alcohol was often served at the polling and voting centers to get the crowds to come out. The candidate who provided the best and most alcohol was usually elected.
Think of the some of the campaign slogans. Such as the "Hard Cider Candidate".... William Henry Harrison. The hard cider ran like water in that campaign. So in this painting you see the voting going on and drinking going on right with it.