(MCT) — The first TV ad in the special primary election to replace ex-U.S. Rep. Jesse Jackson Jr. comes from New York Mayor Michael Bloomberg's super political action committee and targets Democrat Debbie Halvorson's support of gun owner rights.

A spokesman for Independence USA, Bloomberg's gun control-backing super PAC, said it will launch what it called a "significant" TV and cable ad campaign Wednesday to inform Chicago-area voters about Halvorson's past support from the National Rifle Association. No details on the size of the ad buy were disclosed.