As the Wisconsin Senate debates the proposed voter ID bill (SB 6), which requires a valid photo ID to vote, I was interested in the spatial distribution of disenfranchisement that might occur. Unfortunately, there’s little detailed data on registered voters and drivers licenses that’s publicly available for a comprehensive analysis. As a proxy, I’ve compared the number of valid drivers licenses from the Department of Transportation (available here for 2009) to the number of registered voters from the Government Accountability Board (available here for 2010).
Interpretation of this map requires caution for several reasons: 1) it doesn’t include all forms of ID that can be used (e.g. military IDs) for which detailed data isn’t available, 2) many drivers have licenses without a current address, 3) many drivers are not of voting age, and 4) the data are not from the same year.
Several counties (Dane, Milwaukee, Ozaukee, and Door Counties) have more voters than drivers, meaning that currently registered voters within these counties will have to obtain new IDs to vote. The total voters without drivers licenses within these counties, 20,162 voters, is well within the margin of recent elections. The largest numbers are from Dane and Milwaukee Counties which have traditionally voted heavily for the Democrats. Will there be a differential impact on future elections?
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.