The 2-party swing in Fairfax/Arlington Counties and the surrounding municipalities from 2012 to 2013:
Wow. The more I think about this election, the more it suggests to me that Obama actually overperformed generic progressive D in rural areas and that there is still ground for Democrats to gain in wealthy suburbs.
The wealthiest suburbs are one place where there was a bit of a flowback in 2012, so "duh". (Yes, including in Arlington and Loudoun. Not in Fairfax taken as a whole but that's probably the Republican collapse among new minorities. I'm sure it happened in the northwest of the county.)