Missouri's GOP primary is still playing out, with Brunner the slight favorite over former state Treasurer Sarah Steelman (R) and Rep. Todd Akin (R-Mo.) in third place in the race. The group's decision to attack Brunner indicates it might prefer Steelman in the general election.
The North Dakota ad is running statewide, while the Missouri ad is running in the St. Louis, Kansas City and Springfield media markets. The group is spending nearly $500,000 on the two ads and one running in Wisconsin that attacks former Gov. Tommy Thompson (R) and businessman Eric Hovde (R). That ad has not yet been released.