In some states, they found, it would cost a mere $ 1 to change one percent of voter records, while the median cost was just $ 41. (sciencedaily.com)
The data on the Wikipedia page linked above is based on exit polls, not on voter records (which I'm assuming are anonymous, just like in the UK). (politics.stackexchange.com)
Wilson said states already keep voter records, and there's no reason for the federal government to duplicate the efforts. (wxxinews.org)