Missouri campaigns for this summer’s primary are being driven by fundraising and ad spending around ballot measures rather than by candidate contests. Committees reported more than $27 million raised to promote or oppose constitutional amendments on the Aug. 4 ballot, according to filings with state and federal authorities.
Big money centers on two amendments
Though the primary ballot lacks a marquee statewide candidate race, voters will decide on four constitutional amendments. Two measures — Amendment 4 and Amendment 5 — have drawn the bulk of the financial activity.
Amendment 4 would change how passage of citizen-initiated constitutional amendments is calculated, requiring approval in all of Missouri’s congressional districts rather than by a statewide vote total. Amendment 5 would obligate lawmakers to set revenue triggers for reducing the income tax and allow for an expanded or increased sales tax.
Who’s raising and spending
Campaign committees filed reports covering April 1 to June 30 showing about $12.9 million in contributions in that window. Additional large donations reported this month pushed the total raised beyond $27 million.
- Missourians for Fair Governance (backed by Missouri Realtors) has raised almost $6 million and spent at least $1.6 million on a statewide advertising campaign that began in June.
- Protect Majority Rule Missouri, working with the Realtors-backed group, has raised about $5.3 million and recorded roughly $257,000 in ad buys that started this week.
- Protect Election Integrity, the committee supporting Amendment 4, reported about $51,000 in contributions.
- Missouri Promise, the leading funder for Amendment 5, has raised roughly $12.7 million. That committee is financed largely by not-for-profit organizations that do not disclose their funders and has spent at least $4.8 million.
How the spending stacks up
The money aimed at these ballot questions outstrips the combined fundraising of most candidate contests on the primary ballot. There are competitive races — three congressional primaries and contests in 12 of the state’s 17 Senate districts — but their combined cash hauls do not match the funding flowing into the amendment fights.
| Committee | Affiliation/Focus | Reported funds raised | Reported ad spending |
|---|---|---|---|
| Missourians for Fair Governance | Opposes Amendment 4; backed by Missouri Realtors | ~$6,000,000 | $1,600,000 (statewide ad campaign) |
| Protect Majority Rule Missouri | Opposes Amendment 4 | $5,300,000 | $257,000 (ads beginning this week) |
| Protect Election Integrity | Supports Amendment 4 | $51,000 | Not reported |
| Missouri Promise | Supports Amendment 5 | $12,700,000 | $4,800,000+ |
Campaign finance filings show a lopsided dynamic: opponents of Amendment 4 have far more money on hand than supporters, while Amendment 5’s backers have collected the lion’s share of contributions for that measure.
The dominance of ballot measure spending is notable in a year when there is not a closely watched statewide primary contest. Large ad buys and out-of-state or nonprofit funding channels are reshaping the information voters see in the weeks before the Aug. 4 election.
Voters heading to the polls will be asked to weigh changes that could alter how Missouri’s constitution is amended and how state taxes are adjusted — decisions being shaped now largely by well-funded advocacy committees rather than candidate campaigns.
