in September, the FBI warned Florida election officials that Russians had tried to hack Florida-based VR Systems, an elections vendor. When election day rolled around a couple months later, North Carolina precincts started experiencing significant voting irregularities. People showing up to vote were being told they had already voted. And, the electronic systems — known as poll books — indicated that some voters had to show identification, even though they did not. The poll books vendor: VR Systems. Officials are still investigating.