Actually, California laws have more bearing on other states than you would think.
The main reason is because it is a huge state, and a huge market share. In the case of these guns and Disney, if they can not sell them in Cali they might not be profitable enough in just Florida to justify still selling them.
When California makes laws they often affect all of us. In Cali young children's pjs have to be fire retardant, so now almost all pjs are. Most companies don't want to bother making two batches.
Another major example is textbooks. Cali often makes laws about certain things they can and can not have in their textbooks. They are a huge market share, so the companies can't afford to not sell there, and so change the textbooks for the entire country. This is a big part of why you will see people form outside states get more involved in Cali politics than some most other states. And, hence the expression, as goes California, so goes the country.