Actually people typically move to places with similar ideologies. That's a false idea that migration turns red states blue. That isn't happening.
Absolutely correct.
Just look at, for example, 1976 and 2008 Colorado!
Not sure what your point is. Yes, migration into formerly red states like Vermont and Colorado absolutely did turn them blue ... but on the flip side, migration (during the 1950s, 1960s and especially the 1970s) into formerly blue states like Virginia, Texas and Florida slowly turned those states red (during the 1980s and 1990s). Of course, now the opposite is happening again with those states (well, at least pushing them in Democrats' direction in the case of Texas and Florida), but I think his point was that migration into a state itself does not inherently spell trouble for Republicans ... it just is right now in most battleground states.
Migration didn't turn southern states to the Republicans in the 80's and 90's....the Democrats stopped catering to southern conservatives and took up civil rights issues as a policy position. That was poison to all the southern white voters.
Initially they voted third party but later migrated to the Republicans.
It started with them voting Republican in presidential elections and worked it's way down to Congressional races later and local elections after that.
Ah, liberals' favorite fantasies. Notice he named the three Southern states that drifted Republican well before the rest of the South and well before the civil rights era.