My understanding is that the union contracts are harder to roll back than normal spending because they are legally binding contracts. Even if they got a 2/3rds

My understanding is that the union contracts are harder to roll back than normal spending because they are legally binding contracts. Even if they got a 2/3rds majority in the Democrat controlled legislature to repeal union benefits, would they have the legal power to do so? And is the 2/3rds vote on everything, just budget related items, or taxes? I hear the complaint about how hard it is to raise taxes in California alot, but California has a high tax burden.