A large number of people have been moving away from states with high taxes and heavy regulation of business (like New York and California) to states with low (or no) income taxes and a regulatory climate that is more friendly towards business (like Texas, Florida and North Dakota).
This can be counter-productive.
Normally, Democrat ruled states have very high tax rates, while those ruled by the GOP have lower rates. When businesses move from high-tax states to low-tax states, they also take with them the mostly Democrat-oriented employees. As a result, the GOP becomes weak in these states. Look at the case of Nevada. It turned blue for the exact same reason.
It is the mostly white-collar jobs which are moving to low-tax states. Most of the employees, working with these firms are pro-GOP. The recent phenomenon of Red states turning blue has more to do with demography than inter-regional migration.