The group, which circulated petitions to restrict eminent domain, is arguing that the secretary of state wrongly invalidated thousands of signatures on those petitions.
The two lawsuits contend the measure violates the Missouri Constitution's prohibition against petitions dealing with more than one subject.
The candidates showed their differences on higher education funding and how judges are selected.
Judy Baker's resounding primary win has the Democratic Congressional Campaign Committee thinking the 9th - which elected Kenny Hulshof to office six times - can be taken.
Both win by large margins.
The incumbent beat Sid Sullivan with 70.6 percent of the vote.
Cathy Richards won the Democratic nomination for Boone County public administrator on Tuesday, setting up a November general election contest against Republican John D. Sullivan.
In November, Zweifel will face state Sen. Brad Lager, of Savannah, who was uncontested in the Republican primary.
Only one of the 134 lawmakers seeking re-election was defeated.
Both easily win their primary elections.
Gwen Ifill of PBS will moderate the vice presidential debate in St. Louis.
Both Hulshof and Steelman have planned final campaign stops that branch away from southwest Missouri.
Some volunteer and others get paid, often working long hours as the November election nears.
The Boone County Clerk's office expects about 32,000 voters to cast the ballots Tuesday that will determine who will move on to November's general election.
Knox County will likely have the highest turnout; Butler County, the lowest.
Sullivan says master plan should be more specific and ensure rural character; Miller says county can't tell developers how to use their land.
Tim Kaine, whose name has made national news this week as a person of interest in Barack Obama's search for a running mate, graduated from MU in 1979 with a bachelor's degree in economics.
Candidates Bob Pund, Sean Spence, Mary Still and Ryan Asbridge discuss their backgrounds and why they're running.
The use of a voluntary questionnaire in setting the appraised values of homes has become a hot issue between the incumbent, Tom Schauwecker, and his challenger, Barbara Bishop.
Days before the Aug. 5 primary, 9th District candidates outlined their views on what immigration policies the United States should have.