Many news outlets (NY Times, Wall Street Journal) are talking about gerrymandering, but they all basically say the same thing:
- Gerrymandering's been going on forever
- Republicans are the primary culprits and Democrats the victims
- Democrats are using it effectively this year to negate the Republicans' historic advantage
- Democrats had a huge advantage from gerrymandering for 50 years.
- Gerrymandering's effect in 2018 and 2020 was almost nil.
- Democrats gerrymandered in 2010-2020 as well, and the most gerrymandered state is California.
- Democrats passed numerous commissions in the 2010s to reduce gerrymandering, but those are basically ignored.
Why Is This Important?
Republican Gerrymandering Isolated to 3 Election Cycles Out of Last 25
Taking a historical perspective, you can see that Democrats held the advantage in seats continuously from 1946 to 1994. With some years having an advantage of more than 40 seats. The average from 1958 to 1992 was 28. Then in the 1990s, after the Republican revolution, Republicans began punching above their weight, winning more seats than votes from 1996-2006, with a switch during the Democratic wave of 2008. Then, because Republicans were so successful at all levels in 2010, they finally had the chance to gerrymander districts for themselves, on a scale they were never able to before. You can see the effect of that in 2012-2016, where they averaged a 19 seat advantage for three cycles. Then in 2018, when Democrats retook Congress, that advantage shrank to just 1, then 2 in 2020.
Gerrymandering Effect in 2018 Very Small
States with gerrymandering commissions
Background Links
Notes on Methods and Sources
- I did analysis using different sources and at different times, so numbers don't always match up. Primarily, the state analysis and national analysis were done using different sources.
- National analysis used data provided through Wikipedia (their sources are always listed).
- The basic methodology was not strictly a gerrymandering analysis but was a comparison of the composition of votes by party to the composition of seats. In a randomly distributed state, with fairly drawn maps, this should not lead to a difference in seats of more than 1.
- Four races had only one candidate so the votes weren't tallied or entered.
- Taking the national composition and comparing to seats ignores that there are several states with only one seat so can't be gerrymandered.
- Because the voters are not distributed uniformly by party throughout the country, there can be discrepancies between the vote composition and seat composition due entirely to geographical distribution.
- Results can change from election to election based on turnout. When one party turns out in higher numbers, it gives the illusion of a temporary gerrymander.