"Los Angeles is fortunate to have someone like Rick Caruso running for mayor. He's awesome," he wrote on Twitter Friday.

Musk noted that it is "rare" for him to "endorse political candidates," according to another Twitter post.

"My political leanings are moderate, so neither fully Republican nor Democrat, which I am confident is the case for most Americans. Executive competence is super underrated in politics—we should care about that a lot more!"

Caruso, a billionaire who recently changed his party affiliation to Democrat and sits on the board of the Ronald Reagan Presidential Foundation, is running against Rep. Karen Bass (D-Calif.). Caruso was a Republican until 2019 when he became an independent. Current Mayor Eric Garcetti, also a Democrat, faces term limits and won't be on the ballot.