Former justices Jon Wilcox and David Prosser also announced their support, along with appeals court judges Mark Gundrum, a former Republican state lawmaker, and Brian Hagedorn, who used to be Gov. Scott Walker's attorney.
Screnock nets endorsements from conservative justices →
The two groups have spent a combined $7.3 million to support Annette Ziegler, David Prosser, Michael Gableman and Patience Roggensack's campaigns since 2007, the letter said.
News from around Wisconsin at 5:28 a.m. CDT →