In Supreme Court Debate on Voting Rights Act, a Dubious Use of Statistics

By NATE SILVER, NYT

In oral arguments before the Supreme Court last week, Chief Justice John G. Roberts Jr. introduced a statistical claim that he took to imply that an important provision of the Voting Rights Act has become outmoded.

Section 5 of the Voting Rights Act, which is being challenged by Shelby County, Ala., in the case before the court, requires that certain states, counties and townships with a history of racial discrimination get approval (or “pre-clearance”) from the Department of Justice before making changes to their voting laws. But Chief Justice Roberts said that Mississippi, which is covered by Section 5, has the best ratio of African-American to white turnout, while Massachusetts, which is not covered, has the worst, he said.

Chief Justice Roberts’s statistics appear to come from data compiled in 2004 by the Census Bureau, which polls Americans about their voting behavior as part of its Current Population Survey. In 2004, according to the Census Bureau’s survey, the turnout rate among white voting-aged citizens was 60.2 percent in Mississippi, while the turnout rate among African-Americans was higher, 66.8 percent. In Massachusetts, conversely, the Census Bureau reported the white turnout rate at 72.0 percent but the black turnout rate at just 46.5 percent.

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