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## Mathematicians Study Effects of Gerrymandering On 2012 Election413

HughPickens.com writes Gerrymandering is the practice of establishing a political advantage for a particular party by manipulating district boundaries to concentrate all your opponents' votes in a few districts while keeping your party's supporters as a majority in the remaining districts. For example, in North Carolina in 2012 Republicans ended up winning nine out of 13 congressional seats even though more North Carolinians voted for Democrats than Republicans statewide. Now Jessica Jones reports that researchers at Duke are studying the mathematical explanation for the discrepancy. Mathematicians Jonathan Mattingly and Christy Vaughn created a series of district maps using the same vote totals from 2012, but with different borders. Their work was governed by two principles of redistricting: a federal rule requires each district have roughly the same population and a state rule requires congressional districts to be compact. Using those principles as a guide, they created a mathematical algorithm to randomly redraw the boundaries of the state's 13 congressional districts. "We just used the actual vote counts from 2012 and just retabulated them under the different districtings," says Vaughn. "If someone voted for a particular candidate in the 2012 election and one of our redrawn maps assigned where they live to a new congressional district, we assumed that they would still vote for the same political party."

The results were startling. After re-running the election 100 times with a randomly drawn nonpartisan map each time, the average simulated election result was 7 or 8 U.S. House seats for the Democrats and 5 or 6 for Republicans. The maximum number of Republican seats that emerged from any of the simulations was eight. The actual outcome of the election — four Democratic representatives and nine Republicans – did not occur in any of the simulations. "If we really want our elections to reflect the will of the people, then I think we have to put in safeguards to protect our democracy so redistrictings don't end up so biased that they essentially fix the elections before they get started," says Mattingly. But North Carolina State Senator Bob Rucho is unimpressed. "I'm saying these maps aren't gerrymandered," says Rucho. "It was a matter of what the candidates actually was able to tell the voters and if the voters agreed with them. Why would you call that uncompetitive?"

## The US Redrawn As 50 Equally Populated States642

First time accepted submitter Daniel_Stuckey writes "Bam! For anyone that's paid a speck of attention to the tedium of political redistricting, which happens while a state grows unevenly, (and must dynamically respond to density, electorate disparity, natural resources and ridgelines, etc.), this is straight out of some psychedelic dream. For Democrats, it could be straight out of a nightmare. That's because Freeman's map necessitates 50 equally populous United States. His methods for creating the map are explained thusly: 'The algorithm was seeded with the fifty largest cities. After that, manual changes took into account compact shapes, equal populations, metro areas divided by state lines, and drainage basins. In certain areas, divisions are based on census tract lines... The suggested names of the new states are taken mainly from geographical features.'"

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