The Presiding Commissioner signs the county budget and sets the levies. Here is how she handled her own money, her own paperwork, and her own campaign.
See the record6 of 10
Years she paid the property tax on her own home late. Twice it was more than a year overdue. Source: Platte County Collector.
Platte County Circuit Court · 2017
The City of Kansas City took her to court for delinquent earnings tax. A process server handed her the summons.
Platte County Collector · 2016–2025
2016. 2017. 2018. 2019. 2021. 2023. Two of those bills sat unpaid for more than a year.
She wants new taxes. She paid her own when she got around to it.
Platte County Clerk · April 2026
One form. One deadline. She missed it, and it took a 2–1 vote of the County Commission to keep her on the ballot.
If she can't handle the simplest requirement of running for office, how does she run a county?
Missouri Ethics Commission · Refiled September 23, 2026
A $2,000 PAC check left off every report. Donor totals wrong on 181 of 185 lines. She refiled all four in one night — and the numbers still don't add up.
She can't get the basics right on her own campaign. How can she run a county?
Missouri Ethics Commission · Case #26-0079-I
"Call your brother in law, call your mom… It doesn't matter who you call." Under Missouri law it is the only thing that matters — a class A misdemeanor, up to a year in jail.
Stone Canyon Pizza · June 11, 2026
She sat down privately with Dale Brouk, Kevin Robinson, the party chair, and a state legislator. Then she posted that insiders decide things "without public comment."
Her campaign Facebook page · June 2026
Her page told readers to send them "back to the holes they crawled out of."
Is this really the leader for Platte County?
Collector · Circuit Court · Voter roll
On the ballot she's Mary McKenna. On the tax rolls and in the court file she's Mary P. Hejna — same house, same phone number. Search the ballot name and none of this comes up.
Platte County Democratic Central Committee · At-large member
Endorsed and organized by the party chair. Pushing a new county sales tax and "an equitable tax base" — her words. Her closed-door meeting was with the House Minority Floor Leader, not the people who pay the bills. No documented job since her radio show ended in 2011.
Out of touch with ordinary Platte County residents.
She's not qualified, she's not a leader, and she has no business running Platte County.
She likes taxes. She just doesn't like paying them herself.
Check the sources