Nineteen states have toughened their voter identification laws in the last two years.
At least a third of the remaining states have challenges still pending, including South Carolina, Wisconsin, Texas and Florida.
On Wednesday, Judge Robert Simpson .
Supporters argue the laws protect against in-person voter impersonation fraud. As a result, at least 30 states have enacted some type of voter ID reform.
South Carolina's case is expected to be heard in federal court later this month.
But are stronger Voter ID laws needed?
Data from a project funded by the Carnegie and Knight foundations showed that in-person voter fraud is virtually nonexistent in the United States, with only 10 cases confirmed since the year 2000, The Huffington Post reported.
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