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In Voting Rights Arguments, Chief Justice Misconstrued Census Data

Mar 1, 2013
Originally published on March 1, 2013 7:20 pm

At the voting rights argument in the Supreme Court on Wednesday, Chief Justice John Roberts tore into Solicitor General Donald Verrilli, grilling him on his knowledge of voting statistics.

The point the chief justice was trying to make was that Massachusetts, which is not covered by the preclearance section of the Voting Rights Act, has a far worse record in black voter registration and turnout than Mississippi, which is covered by Section 5 of the act.

But a close look at census statistics indicates the chief justice was wrong, or at least that he did not look at the totality of the numbers.

So, let's start with the exchange in court:

Roberts: "Do you know which state has the worst ratio of white voter turnout to African-American voter turnout?"

Verrilli: "I do not."

Roberts: "Massachusetts."

Roberts went on to add that the state with the best record, where African-American turnout actually exceeds white turnout, is Mississippi.

Roberts' questions and conclusion appear to be taken from a census survey cited in a lower court dissent. But upon close examination, the numbers are less than reliable, according to the Census Bureau itself.

Here's the deal. The Census Bureau does voting surveys to look at voting patterns nationwide, but the survey is based on a very small sample. Most recently, in 2010, the survey looked at 94,208 voters nationwide. Break that up into roughly proportional samples in each state, Census officials say, and it is really not possible to compare states because those with relatively low minority populations have a much higher margin of error.

The number of black citizens eligible to vote in Massachusetts is 236,000, while it is 721,000 in Mississippi, more than three times that number. Therefore, according to Census officials, when looking at the estimated turnout rate in Massachusetts, the voting percentage for African-Americans at first blush is estimated at 39.3 percent. But the margin of error is 11.5 percentage points, meaning that the black voter turnout actually could be as high as 50.8 percent (or, conversely, as low as 27.8 percent).

Now, look at Mississippi, where black turnout is listed at 48.7 percent. But because of the large size of the African-American population that was sampled, the margin of error is only 5.4 percentage points.

That means that factoring in the margin of error, the black turnout rate in Mississippi could be as high as 54.1 percent, or as low as 43.3 percent.

So, if you factor in the margins of error at their extremes — with Mississippi at the low end and Massachusetts at the high end — Mississippi could have had a black voter turnout rate that was 7.5 percentage points lower than Massachusetts.

Bottom line, as Census officials told me, these numbers are simply not reliable for state-by-state comparisons because of the high margins of error in some states.

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