Its Fairfax County - its Deep Blue and that’s why Virginia is no longer a Red State.
Without it, Gillespie would have won comfortably.
Not just Fairfax County, but Arlington and Alexandria and Norfolk. Like every other state, it’s the populous areas that are blue.
But the question now isn’t WHERE Warner held the advantage, but why Gillespie isn’t conceding with as significant a difference as there appears to be.