(From left) Republican state Sen. Rob Schaaf, former Republican state Sen. Jim Lembke and Sean Soendker Nicholson. Schaaf and Lembke backed the so-called Clean Missouri amendment, while Nicholson ran the successful campaign to get it approved last fall.

(From left) Republican state Sen. Rob Schaaf, former Republican state Sen. Jim Lembke and Sean Soendker Nicholson. Schaaf and Lembke backed the so-called Clean Missouri amendment, while Nicholson ran the successful campaign to get it approved last fall.