i'm trying to understand how or why you would manipulate votes like this
call me crazy but i think mass-scale communication is a better way to manipulate votes, it allows people far away from each other to coordinate their numbers
but if you cut off their coordination mechanism they can't exchange information, and perhaps they might fear pushing out fake numbers in case the numbers of them plus a few others look strange. the best defense would be honesty
If people are going to vote a certain way out of fear or due to having been misled, cutting off communication is a safeguard against those people caning their minds or being convinced by facts. Just for one example.
If you're making your choice based on breaking news on election day, you're the one being manipulated.