The promotional ad was for the Super Bowl.
"Me likey Broke Girls," Hardy tweeted.
The tweet was deleted 14 seconds later but remained on a website that collects tweets from politicians, according to the Idaho newspaper.
Labrador's office apologized for the tweet on Monday.
Labrador made the final decision to let Hardy go, Labrador's Idaho District Director Jake Ball told the Statesman.
"That's Raul's call," Ball said.
Hardy worked for Labrador since 2010 and previously worked in the music industry. He also served as a spokesman for Idaho's Senate GOP caucus.