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The voters of Missouri this month overwhelmingly passed a constitutional amendment with the aim of making their state government work in less partisan, less corrupt ways.

The amendment bars lawmakers from accepting lobbyists’ gifts worth more than $5. It also bars former state officials from accepting a paid lobbying job for two years after leaving office. And it changes the process for drawing state-legislature districts to be fairer for both parties.

Some 62 percent of Missourians voted for the amendment, known as Clean Missouri. And yet, in the three weeks since Election Day, top Republicans in Missouri have started a cynical effort to weaken the new law.