Colorado Senate

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Colorado House / Colorado Senate

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2020 Election Update

Heading into the 2020 election, Democrats controlled the Colorado Senate 19 to 16. Democrats flipped one seat (SD 27) for a net gain of one seat. Democrats now control the chamber 20 to 15. 

The below table shows 2020 and 2018 election results for the Colorado Senate. The LDI scores are for the 2020 cycle. EveryDistrict will release new scores and district rankings after the redistricting process.

2018 Election Update

After the 2016 election, Republicans controlled the Colorado State Senate 17-18. Heading into the 2018 election, Republicans controlled the chamber 16-18-1. Democratic State Senator Cheri Jahn switched her party affiliation from Democratic to Independent in 2017.

In the 2018 election, Democrats flipped two Republican-held seats and won back Jahn’s seat to take control of the chamber 19-16.

Democrats flipped SD 24 and SD 16. EveryDistrict did not identify any other competitive seats on the ballot in 2018.

Understanding the Map

EveryDistrict’s Legislative District Index (LDI) is the gold standard of state legislative competitiveness. Our LDI ranks state legislative districts on a scale from 100 to -100, using statewide elections data. Districts with a score of 100 would vote for statewide Democratic candidates by an average of 100 points (with the Democratic candidate receiving 100% of the vote); districts with a score of -100 would vote for statewide Republican candidates by an average of 100 points (with the Republican candidate receiving 100% of the vote). For a more realistic example, a district with a score of 10 would vote for statewide Democratic candidates by an average of 10 points (meaning we would expect the Democratic state legislative candidate to win with 55% of the vote compared to the Republican winning 45% of the vote).

After the 2018 election, EveryDistrict reviewed and enhanced our LDI system, improving the accuracy of the metric with new methodologies and the most recent electoral data.

For more information about EveryDistrict’s LDI, please click here.