VA-8. I say Mark Levine gets the Democratic nomination. He probably faces Charniele Herring and a few Arlington council people. He is pretty much guaranteed a win in the general after that.
Regarding: VA08
There's one independent on the Arlington co Board who won because of his opposition to huge projects like affordable housing and the infamous streetcar. Would be interesting if he won. He's about as conservative as Bill Nelson, so he could put up a fight. Even this year, the republican congressional candidate, ran more than 10 points ahead of Trump. Of course, trump is radioactive here, but who knows.