Well, it swung like another 10% left during 2016-17-18.
True, I still stand by we can not expect everything will be 100% partisan correlated forever. Loudoun County GOP is still somewhat competitive down ballot and the GOP was able to retain to retain an incumbent sheriff in 2019. Trump is not the sole reason for polarization but is a large part of it and I still believe in 2018 we had a Democratic wave and an underlying pro-Trump wave
That it was already (narrowly) over the line in 2008/12 doesn't change that.
Barely? Loudoun County may have been barely over the line in 2008 and 2012 but Prince William and Fairfax were significantly more Democratic than the national median. I know that Obama would have lost Virginia in 2012 without Nova.
Gerry Connolly came within 2K votes of losing an outer Fairfax based CD in 2010. Most of those areas are now 2:1 Dem.
That is correct but it still does not change the fact that Obama swept all of Nova by far above his national median in 2012 while roughly matching it in Loudoun.
My problem is that people believe that Romney swept Loudoun, Prince William and Fairfax Counties when it simply is not true! The are largely the same people who believe Mers and the Swine Flu came from China. No matter what facts you present them they are never convinced.
There are Romney-Clinton voters in NoVa but there are far more Obama-Clinton voters and many transplants to the area who voted Democrat.
Warner lost Loudoun as late as 2014. The 20% Dem margins there are a new phenomenon.