Gerrymandering Data
Past Five House Elections
The link above takes you to a breakdown of the last five National House races (2008, 2010, 2012, 2014, 2016). Per election year, the first two columns are the actual number of votes cast to the Democrat and Republican candidates of each state. Using this data, the next two columns project how many Democratic and Republican representatives each state would get based on the popular vote of the state and the number of representatives allocated to the state. The next two columns are the actual election results; how many Republican and Democratic representatives a state received based on who won the districts.
If a state received two or more Democratic representatives than projected by the popular vote, the actual allocation of representatives is highlighted in blue. The same was done with red highlighting for Republicans.
After 2010, the party in control immediately after the 2010 election is indicated, as this is the party responsible for redrawing district lines after the 2010 Census. If the control of the state house shifted to the Republicans, this column is highlighted in soft red. No states shifted control to Democrats after the 2010 elections.
I still feel there is a lot of data analysis to be done with regards to gerrymandering, but one thing this simple study shows is that the practice appears to have become more widespread on both parties following the 2010 redistricting, aided by advances in technologies such as GIS.
