You're way overthinking it. Most voters belong to a political party, which is a public record that anyone can look up. Same for campaign contributions. DNC and

You're way overthinking it. Most voters belong to a political party, which is a public record that anyone can look up. Same for campaign contributions. DNC and RNC and various private entities maintain databases of voters' political leanings. One wouldn't need to compromise the voting system to get a list of who (likely) voted for whom.