From PH: "I've also promised them that I'll drive them to the polls, and buy them a beer or five afterwards. "
In Baltimore, and perhaps in PH's county, you can't buy alcohol in a restaurant until the polls close at 8.
Apparently the laws have changed. Talbot County seems to be the only county to bar alcohol sales during polling hours, but this appears to be for "carry-out," only. Interestingly, the city of Annapolis was miraculously left off the list of allowed jurisdictions until 2015.