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Some 86 years ago, Missouri voters enshrined a system for selecting top judges that would remove political influence from the courts. And almost immediately, it came under attack.

Under what has come to be known as the Missouri Plan, lawyers help choose a slate of three candidates from which the governor must make an appointment for the state Supreme Court, appeals courts and, in some populous areas, the circuit courts. 

In the first years after adoption, it faced pushback from party bosses who had historically used judicial seats for political patronage. They said it gave too much power to the lawyers. Voters, though, decisively defeated a repeal measure in 1942. 

More recently, the conservative activist Leonard Leo, who viewed Missouri as a crucial battleground, tried in 2007 to persuade Republican Gov. Matt Blunt to reject a slate of Supreme Court candidates — part of a broader effort to weaken a judicial selection system that had become a model for some two dozen states around the country. 

Blunt resisted and picked one of the three judges from the approved slate. 

Then, in 2012, GOP lawmakers put a proposed overhaul before voters that, if approved, would have given the governor more control. Voters, by a 3-to-1 margin, turned back the plan.

Now the attacks are back, driven by a new grievance.