I have rarely seen such a polarized electorate before, to the point that many aren't voting so much for someone, as against someone. If the current crop of candidates aren't enough to drive you to drink, you are either a monk, or attend a very supportive AA group. Hell, some may need a little of that liquid encouragement just to muster up the damn will to vote.
After the election, many people will need alcohol, but I do not think that restricting the sale on election day will help or hurt the election. Many people who would want a drink during the day hours of election day have probably prepared and bought some the day before, so I do not think that this should be a law in all states of the United States.
If the main concern for the restriction of selling alcohol until after the polls close is to keep people from drinking until after they vote, then it only stops people who wake up on election day and decide they want alcohol to drink and do not have any in their house. If this becomes a national law, then alcohol sales will increase the day before elections and people will just drink at home if they want to drink before voting.
People should not be prohibited from drinking just because it is election day. A lot of people do not even vote so there is really no point in stopping the sale of alcohol. If someone is drunk, they are still going to vote for who they planned on voting for anyway. That would not really change.
Blue laws do not prevent people from drinking or getting drunk. People can have alcohol at home. I don't know if it is legal to be drunk while voting, but public intoxication is already not allowed, so it does not seem like much of a problem to me anyway. Most people don't drink and vote.