It's the latest in a string of endorsements McDaniel has received from prominent conservative organizations. He was previously endorsed by the Club for Growth, The Senate Conservatives Fund, FreedomWorks and the Madison Project.
Also on Monday the Madison Project announced a five-week statewide radio ad buy in support of McDaniel.
An October Mother Jones report revealed that McDaniel attended neo-conservative and secessionist gatherings in Mississippi. More recently, McDaniel denied that he attended one of the two neo-confederate events.
Cochran has not said yet whether he plans to run for re-election.