Rep. Marsha Blackburn held a commanding lead in the Aug. 2 Republican primary for Senate in Tennessee, according to a new poll commissioned for the Club for Growth.

The conservative advocacy organization has endorsed Blackburn in the open-seat contest to replace retiring Sen. Bob Corker, R-Tenn. The survey suggests that Blackburn is on a glide path for the nomination. She led former Rep. Stephen Fincher 66 percent to 33 percent; the congresswoman even topped Corker, by 38 percentage points, in a hypothetical matchup. Blackburn’s favorable rating clocked in at 64 percent.