In a statement, Michael Ranatza, executive director of the association, said Landrieu's "senior status" and her continued support for the sheriffs throughout her career were deciding factors.
The position puts him at odds with GOP Gov. Bobby Jindal, but could bolster support from the business community as the senator raises money for the 2015 governor's race.
Hundreds of new laws take effect Friday, with the start of August. A look at some of the changes on the books: