Bloomberg Politics: Partisan Gerrymandering Will Get U.S. Supreme Court Scrutiny

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The voters challenging the Wisconsin map say that researchers using advanced statistical techniques have developed the type of test Kennedy said was lacking in 2004. Their test, known as the "efficiency gap," focuses on how frequently votes in a particular district are effectively wasted, either because they go to a candidate who loses or because they provide the winner with more support than was necessary.

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