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268 pages, Hardcover
Published April 4, 2016
"Put bluntly, if you can pack your opponents into a single district where they win 80% of the vote, you can create [surrounding] districts where you have a 7.5% advantage. It is notable that the number of “incumbent protection” districting plans declined sharply between 2002 and 2012. It seems that more states are districting for national partisan advantage, even though it makes their incumbents slightly more vulnerable."The authors make a distinction between partisan bias and responsiveness. “If there is partisan bias, then one party is advantaged over the other…If a districting system has high responsiveness, then it gives an advantage to the larger party, whichever party that happens to be.”
“…districting is mathematically a very, very difficult problem.”The California independent redistricting commission may have been partly modeled on the British iteration, called Boundary Commissions. Boundary Commissions are explicitly forbidden from considering partisan data when deciding their maps. This has actually led, in CA as well, to skews that were unintentional but partisan in fact. As a result, CA commissions have made the unusual request that they must consider partisan data in order to avoid it.