After 13 years of experience with the national register, I think we have a list that's even better than enumeration would have produced. I rely on that, on the data we had in 1997 when the register was established.
On the challenge we have when we do door-to-door targeted revision, our efforts on revision are quite significant and produce very little benefit. It's harder and harder to get electors to open the door, agreeing to respond or provide information. Again, we continue to do targeted revision in special areas across the country, but it's increasingly difficult.