Note about the data: There were a significant amount of errors that required correction (such as '81' being encoded as '8100'), and while I did my best to correct said errors, the data still may not be 100% accurate.
In 1990, Tom Coleman (R), who had represented Missouri's 6th congressional district since 1976, ran for re-election. However, unlike prior elections that saw Coleman prevail by over 10% each time, this one proved to be the closest of Coleman's career as he narrowly won against Marine Corp Veteran Bobby McClure (D). Coleman's victory was largely due to his margins in the suburbs north of Kansas City, while McClure did best in St. Joseph and the surrounding rural areas. Yet, despite his win, this election proved to be a sign of things to come for Coleman, as his next race saw him lose re-election to Pat Danner by nearly 11-points. In recent years, Coleman (R) has become one of the most vocal Never Trump Republicans, calling Trump's first presidency "illegitimate" and the Republican Party a "cult" in the months following the January 6th insurrection.
I would like to note that it was incredibly difficult to find information about the candidates, let alone the election, which is why my analysis is fairly lackluster.
As of 2025, this is the last time a Democratic candidate received over 60% of the vote statewide.
Further Analysis Coming Soon!
Over the last decade, Missouri has been one of many states to move away from Democrats, with the party struggling to win statewide and 2008 marking the last year it was competitive on the presidential level. 2018 would be no different, as after losing all statewide offices in 2016, Democratic Senator Claire McCaskill lost her seat to Attorney General Josh Hawley. However, even as McCaskill went down, State Auditor Nicole Galloway (D) managed to win re-election to her first full term*. Galloway faced off against Saundra McDowell (R), who faced several controversies throughout the campaign, most notably lawsuits surrounding unpaid debt. This, combined with Galloway casting herself in a nonpartisan light and what The Kansas City Star described as "a refreshing display of independence", allowed Galloway to hold on to her post by 5.8%. Galloway trounced McDowell in the Democratic strongholds of Kansas City, St. Louis, and Columbia while winning in the suburbs, St. Joseph, Springfield, and even rural areas that have long been trending rightwards.
However, Galloway's victory would prove to be the last hurrah of Missouri Democrats, as in the gubernatorial election two years later, Galloway, like every other Democrat running statewide, was soundly defeated. Galloway retired in 2022 and Republicans picked up the office, making Galloway's victory in 2018 the last time a Democrat has won statewide in Missouri. Since then, the closest Democrats have come to winning a statewide election was the 2022 and 2024 Senate races, which they lost by 13.25% and 13.73% respectively, indicating Galloway's victory will likely be the last for a long time.
*Galloway was appointed as State Auditor by then-Governor Jay Nixon (D) in 2015 after the previous State Auditor, Tom Schweich (R), committed suicide.
Further Analysis Coming Soon!