He has a home in TN as he has businesses there, but rarely is there. What he did is illegal but does not hit the fraud level you could not see who he voted for nor did he say. He could have done it just past the Campaign line and not caused an incident. When he did it it made the nightly news. My news comes out of Memphis.
It would be prudent to check the laws on how many months you have to reside in your state you are registered in and if he is registered in CA too.
The Snow Birds do it in Fl.
California taxes your total personal income like a “resident” if you spend any part of 183 days in a calendar year within the borders of the state.
Taylor Swift also owns a home in Nashville and frequently visits there. However, she did in fact begin her career as a Country Music performer in Nashville, and also attended public school there.
Selena Gomez is originally from Texas, but her parents moved to Tennessee after they became Selena’s managers. I think Selena fired them recently, so I don’t know how that affects her state income tax status.