Sharp differences over spending and strategy are cleaving House Republicans as the two main groups charged with saving the party’s embattled majority in the midterm elections go separate ways in key suburban battlegrounds.

Congressional Leadership Fund, the super PAC aligned with senior GOP leaders, canceled advertising in the expensive Denver media market, and never invested in costly D.C., concluding vulnerable Reps. Mike Coffman, R-Colo., and Barbara Comstock, R-Va., couldn’t hold their suburban districts and that the money would be better spent elsewhere.