The Koch Primary: Club for Growth, Marco Rubio Going After GOP to End Ex-Im Bank

The Club for Growth is making an ad buy in the districts of several establishment-friendly Republican members of Congress, pressuring them to vote against reauthorizing the Export-Import Bank when an expected compromise bill comes up. The total buy, across four districts, is "north of $500,000," according to Club spokesman Doug Sachtleben.

Its targets: new Georgia Representative Buddy Carter, North Carolina Representative Renee Ellmers, Tennessee Representative Stephen Fincher, and Texas Representative Bill Flores. Fincher is the key proponent of the compromise; Flores is the Republican Study Committee chairman whose support from leadership inspired some conservatives to leave the group; Ellmers has faced tough primary challenges ever since she took her seat.