Same thing happened in Washington State. I grew up in Colorado and when we moved here, I wouldn’t say it was a totally red state, but it certainly wasn’t as liberal/Marxist as it is now - - primarily on the I-5 corridor. Eastern WA is pretty much Republican.
Californians moved up here in the 80x-90s, increased the price of housing and brought their other liberal values with them.
As other FReepers have noted in other parts of the country, they ruin the area they lived in due to liberal policies then move to a red state and bring they same politics and beliefs with them and ruin that area or state.