The Tennessee Equality Project has rescinded its endorsement of Republican state Sen. Steve Dickerson of Nashville over an ad being run on his behalf by the Senate Speaker Randy McNally’s political action committee.

The ad targets Dickerson’s Democratic challenger, Heidi Campbell, for saying supportive things about Gideon’s Army, which the spot describes as an extremist group calling for “revolutionary changes to our way of life.” Democrats have pushed back against the ad presenting Gideon’s Army as supporting rioting. They point to the group’s efforts to mentor young people and de-escalate violence in predominantly black North Nashville. The organization was also heavily involved in cleanup efforts after a tornado wrought heavy damage in the neighborhood in March. The Tennessee Equality Project denounced the spot as a “disgusting, racist ad.”

“Although he has an exemplary record on LGBTQ rights in the Legislature, elected officials are called to speak out against racism in politics,” TEP executive director Chris Sanders said in a blog post.

Here’s the ad:

The decision to withdraw the Dickerson endorsement means the group is now backing just one Republican candidate for the General Assembly: Knoxville businessman Eddie Mannis, who is running to succeed retiring state Rep. Martin Daniel (R-Knoxville).