How Missouri Has Voted in Senate Elections Since 1990

For decades, Missouri was America's political oracle, a bellwether state whose votes mirrored the nation. But its Senate elections since 1990 tell a different story: a slow, dramatic, and decisive transformation from purple swing state to solid red.

The Bellwether Days: Predictable Contests

In the early 1990s, Missouri's political landscape was competitive but stable. The Senate delegation was split between Republican incumbents John C. Danforth, Christopher 'Kit' Bond, and later, John Ashcroft. These figures represented a traditional brand of Midwestern Republicanism. Elections were often hard-fought, but the outcomes rarely shocked the national system. The state consistently sent Republicans to the Senate during this period, including Bond's re-election in 1992 and Ashcroft's win in 1994, reflecting a state that was comfortable with established, center-right leadership but was by no means a foregone conclusion for either party.

A Tragic Turn and a Posthumous Victory

The 2000 Senate race was one of the most tragic and unprecedented in American history. Democratic Governor

Mel Carnahan challenged incumbent Republican John Ashcroft in a tight, bitter contest. Just three weeks before the election, Carnahan, his son, and a campaign aide died in a plane crash. Under Missouri law, it was too late to remove his name from the ballot. In a stunning result driven by an outpouring of sympathy and support, Missouri voters elected the deceased Carnahan. Acting Governor Roger Wilson then appointed his widow, Jean Carnahan, to serve in his place, making her the first woman to represent Missouri in the U.S. Senate. However, she lost a close special election in 2002 to Republican Jim Talent to finish the term.

The Last Democratic Victories

The mid-2000s offered Democrats a final window of opportunity. In 2006, State Auditor Claire McCaskill, running on a wave of national dissatisfaction with the Bush administration, narrowly unseated incumbent Jim Talent. She became the first woman elected to the Senate from Missouri. Six years later, in 2012, McCaskill was considered one of the most vulnerable Senate Democrats. Her re-election chances seemed slim until her Republican opponent, Todd Akin, made widely condemned remarks about 'legitimate rape'. The resulting firestorm crippled his campaign, and McCaskill won a second term by a surprisingly comfortable margin. It would be the last time a Democrat won a statewide federal race in Missouri.

The Red Tide Solidifies

The state's rightward shift, already visible in presidential elections, soon cemented itself in Senate races. In 2010, seven-term Congressman Roy Blunt easily defeated Democrat Robin Carnahan (daughter of Mel and Jean) to fill Kit Bond's retiring seat. In 2016, Blunt survived a strong challenge from Democrat Jason Kander in a year when Donald Trump won the state by a massive margin. The final piece of the puzzle fell into place in 2018, when Republican Attorney General Josh Hawley unseated Claire McCaskill, running a campaign closely aligned with President Trump. Hawley's victory meant both of Missouri's Senate seats were held by Republicans for the first time since 2007. This trend was locked in when Republican Eric Schmitt won Blunt's open seat in 2022 with little suspense.