Read this Roanoke Times article.
The short version:
— Americans for Prosperity, a Koch Brothers PAC, knocked on doors, asking people if they voted in the last election and the one before that and the one before that . . .
— AFP then sent mailings to neighbors telling them you DID NOT vote in one or more past elections.
— When questioned about this tactic, AFP replied: “Well, golly gee whiz Aunt Bee — we are just reminding people how important it is to vote!!”