Sure. CT cites a Gateway Pundit article from 2014 that points the finger at Governor Haley Barbour and his PAC for the Mississippi ads and that they received money from the NRSC. Which is further alleged by Got News and Red State which explicitly states that the NRSC may have been involved based on money from the NRSC to the PAC. However, there is no corroboration. This is a case of correlation and not causation. It basically comes down to, "NRSC may have been responsible for the MS ad buys that supported Cochran on black-owned radio stations because the PAC begain airing those ads around the same time they received money from the NRSC."
So the story is speculation, neither confirmed nor disproven.