What do you say about Virginia, which once was a totally red state? Now with the influx of outsiders into northern Virginia, we have two Rat senators and a Rat governor and lieutenant governor. Were it not for being locally elected, the legislature would be in their hands...and may still be in the future as more of the disease comes into the state from the north.
What I would say about Virginia is that Federal Government employees, and employees of nominally private government contractors, are a whole different case from employees of truly private companies, and entrepreneurs, and retirees. My view is that the transplants to Virginia (whether from the northern U.S. or elsewhere) are not particularly representative of transplants to other southern states.
The election numbers don't lie. In NC, the areas which are growing fastest, and seeing the biggest influx of northerners, are Republican, and becoming more so. Now, I would concede, based on observation only as opposed to election results, that the new arrivals here may have a tinge of RINOism, especially on social issues. But don't try to raise their taxes, reassign their kids to other schools in the name of racial balance, take away their guns, or stop voter-ID laws.