This is actually what America would look like without gerrymandering – The Washington Post

The GOP scored 33 more seats in the House this election even though Democrats earned a million more votes in House races. Professor Jeremy Mayer says gerrymandering distorts democracy. (The Fold/The Washington Post)

In his State of the Union speech, President Obama called on lawmakers and the public to take a number of steps “to change the system to reflect our better selves” for “a better politics.” The top item on that list was to end partisan gerrymandering: “we have to end the practice of drawing our congressional districts so that politicians can pick their voters, and not the other way around,” Obama said.

In most states, state legislatures draw the district boundaries that determine how many delegates the state sends to the U.S. Congress, as well as the general partisan make-up of that delegation. State legislatures are partisan beasts, and if one party is in control of the process they can draw boundaries to give themselves a numeric advantage over their opponents in Congress. This process is called gerrymandering.

The process of re-drawing district lines to give an advantage to one party over another is called “gerrymandering”. Here’s how it works. (Daron Taylor/The Washington Post)

Some state legislatures are more brazen about the process than others. Maryland’s districts, drawn by Democrats, are one particularly egregious example. North Carolina’s, drawn by Republicans, are another. Advocates of reform have proposed various solutions to the problem over the years. In some states, redistricting is put in the hands of an independent commission. In others, lengthy court battles are playing out to draw the districts more fairly.

But a fundamental problem with district-drawing still remains: as long as humans are drawing the lines, there’s a danger of bias and self-interest to creep into the process. There is another way, however: we could simply let computers do the drawing for us.

From a technological standpoint it’s fairly straightforward — a software engineer in Massachusetts named Brian Olson wrote an algorithm to do it in his spare time. As I described it in 2014, Olson’s algorithm creates “optimally compact” equal-population congressional districts in each state, based on 2010 census data. It draws districts that respect the boundaries of census blocks, which are the smallest geographic units used by the Census Bureau. This ensures that the district boundaries reflect actual neighborhoods and don’t, say, cut an arbitrary line through somebody’s house.”

To see what this looks like in practice, compare this map of our current congressional districts (top) with one we stitched together from Olson’s output (bottom).



Big difference, isn’t it? You can check out a larger version of the compacted map here. Rather than a confusing snarl of interlocked districts, you have neat, trim boundaries that make intuitive sense. Here are some individual state comparisons I made back in 2014 that let you see some more of the detail:.

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