A St. Louis County judge ordered a new election between state Representative Stacey Newman and Susan Carlson for the 87th House District. The new Democratic primary election is scheduled to be held on Monday, September 24, 2012.

Initial results of the August 7, 2012 primary showed Newman had won the election by a single vote, but the St. Louis County Board of Election found irregularities soon after the results were announced. The mistakes occurred at a polling place in Brentwood, where poll workers accidentally handed voters ballots with the 83rd District race between James Trout and Gina Mitten.

During the court hearing, it was revealed that 100 voters in the 83rd District received ballots to vote in the 87th District, while two 87th District residents received ballots for the 83rd District. Judge Michael Jamison cited Revised Missouri Statute section 115.593, which allows the court to order a new election if the evidence provided demonstrates irregularities were sufficient to cast doubt on the outcome of the election.