In general, without respect to party:
American voters on average seldom wait over twenty minutes to vote. Entirely banning food and snacks in such voters' typical voting lines would probably not hurt average voters.
But in Georgia some citizens had to wait in line over ten hours to vote; compared to the average American voter, that's a 3000% increase in opportunity cost.
For a Georgian minimum wage earner paid $7.25 an hour, 10 hours is $72.50 -- vs. for the average American minimum wage earner paid $7.25 an hour, 20 minutes is $2.41.
(The lost opportunity cost even trickles upward to the wage earner's employer. Their employer might lose an essential worker for 10 hours, costing them productivity and profit. If the employer unpatriotically fires the worker for taking the time to vote, they then must undertake the expense and stress of finding and hiring a replacement worker.)
Typical American meal times are spaced about five or six hours apart. It is unreasonable and unhealthy to expect citizens not to eat for 10 hours, and we should expect that citizens waiting for 10 hours going to need to eat.
If the queue times were well known in advance, a citizen might prepare themselves for a 10 hour wait by packing rations, like a camper or a soldier. But the queue times are unpredictable, so that a citizen might expect a 20 minute wait, or an hour wait, etc. but not such a long wait as to need to prepare rations. Some, perhaps many, citizens unfortunate enough to be in a 10 hour line could be unprepared.
Some citizens have medical conditions, that require them to eat or drink at certain times. A citizen with a such a medical condition would therefore risk harm if they were caught unprepared in a 10 hour Georgia voting line.
And so forth. In short, compared to the average American's 20 minutes or less wait:
10 hour voting lines are harmful to anyone stuck in one, regardless of political party.
Risking 10 hours without food, and perhaps without drink, (should the Georgians forget to refill the water cooler, or run out of Dixie Cups), would be harmful to anyone, particularly those with medical conditions.
Things that are harmful to any citizen would therefore be harmful to citizens who happen to be Democrats.