Thread by @jcmattingly

1/9 From CC v. Lewis: A particularly striking property of the #ncga 2017 Redistricting Plan was the firewall protecting Republican majorities and supermajorities #gerrymandering #quantifyinggerrymandering
#commoncause

2/9 In trial, we showed animated bar-graphs giving the frequency of different democratic seat counts in the State House as votes from various historical elections were shifted to have statewide Dem. vote fractions between 45% and 55%.

3/9 The story is NOT about proportional representation, rather about how results using #ncga 2017 maps (represented by arrow) systematically under-elected Democrats to a shocking degree (here using presidential
votes from 2012)

4/9 Same story, now with 2016 Lt Governor votes. Notice in both videos as votes shifted to vote fractions which
typically break the republican supermajority and majority in the histogram, the arrow dramatically stays to the left of the majority/supermajority line.

5/9 Same story now with Commissioner of Insurance votes from 2016. Notice how Democrats are systematically under-elected by the #ncga 2017 Redistricting Plan when compared to our ensemble of thousands and thousands of non-partisan maps.

6/9 Same story now with 2016 US Senate votes. Getting worried about our democracy yet? Across many different vote patterns, same exceptionally atypical under-electing of Democrats persists. Effect is very robust across different offices, across different years.

7/9 Same story, now using votes from 2012 Gov. election. Each election has a different spatial vote pattern, yet story persists. 2017 #ncga map under-elects Dems when they would typically gain more power. Notice map keeps Rep majority even when some maps give Dems supermajority.

8/9 Now using 2008 US Senate votes. Again same story. By comparing to the ensemble of non-partisan maps, the deviation we see is in addition to the effect from natural packing or the geography of N.C.

9/9 The map makers have inserted themselves in the electoral process and suppressed the Will of the People. If you are not worried about our democracy, you are not paying attention.

Read Quantifying Gerrymandering blog for more details. tinyurl.com/y3xcvk7g