An analysis by the Government Accountability Office found that turnout voter turnout dropped by at least 2.2 percentage points in Tennessee in 2012, the first election after passage of new voter ID requirements.
The Washington Post has parsed the report, which also analyzed turnout in Kansas and includes breakdowns of the law's effect on turnout generally — as compared with other states — as well as a demographic breakdown, which found a particular impact on African Americans and new voters.
According to the Post's calculations, based on the data in the report, 88,000 Tennesseans likely would have voted if not for the new law.
As you might expect, the states have pushed back against the report. The Post reports that "Tennessee's secretary of state noted that other states may have had more compelling issues on the ballot and that the GAO used data from Catalist, which it labeled a progressive firm."
You can read the GAO's 200-page report here.
