Yes, they admit that it's unenforceable and that makes the whole thing even more stupid than it has to be.

Out here in Idaho the Republicans get a requirement passed requiring a photo id to vote. Then they discovered that, for instance, a new address might not be on a driver's license -- they learned this when the head of the Republican party here was denied a vote in the election last November because the address on his driver's license didn't match with one on the polling records.