Actually a lot of people moving to Texas tend to be conservative from other states moving explicitly for the politics. Conservatives from California in particular.

For instance in Ted Cruz’s last election he got a higher percentage of Voters from new residents than he did from native Texans and of course the inverse.

https://www.dallasnews.com/news/politics/2018/11/09/native-texans-voted-for-native-texan-beto-o-rourke-transplants-went-for-ted-cruz-exit-poll-shows/