The GAO conducted the study after senators, alarmed by the number of states enacting legislation they believe makes it harder for voters to cast ballots, requested it.
North Carolina is included in this category, proposing some of the highest standards for voting in 2016, according to Bob Hall, executive director of Democracy North Carolina.
“This report is even more proof that these state laws significantly suppress and discourage Americans from exercising their constitutionally protected right to vote,” said Sen. Richard Durbin, D-Ill., in a statement. “These new laws will make it harder for hundreds of thousands of elderly, disabled, minority, young, rural and low-income Americans to exercise their most basic right.”
The study compared voting data from 2008 and 2012 in Kansas and Tennessee, where voters are required to show photo ID at polls, to those of a number of other states, where IDs are not required.
While ID requirements vary from state to state, the GAO found that 5 to 16 percent of registered voters lack the proper identification documents required for voting.