Oh yes, I suppose that's right.
In Germany these records are destroyed as soon as the period for challenges is up, to keep this info as secret as possible.
Good thing too. Otherwise the parties'd know exactly who votes every time and who never votes and which people turn out only at important elections - and would mail those poor sods to death.
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What is wrong with focusing your effort on those most likely to vote? It may be too expensive for local candidates to use TV or radio ads in Houston given that the relevant share of the audience (those who live in a particular district) might be 2 to 5% of the total audience. A mailout to voters in the district, or better yet those who are most likely to vote can be more cost effective.
