VA isn't reliably blue. The state senate is split, and the Pubs have a solid majority in the house of delegates. Also I think 8 of the 11 congressional seats are in Pub hands. There has always been a strong religiously conservative base here with Pat Robertson and Jerry Falwell having their schools here. Add to that the Valley is way conservative, the Richmond area often leans red, and the Tidewater area has always leaned red. But with a population influx in the Richmond and Tidewater areas and the state and national Pub party lurching to the right, those areas have become more bluish purple. Add that to NoVa being solidly blue, and that's why elections have been trending bluer here. But remember that we'd also have a Pub governor had the Pubs nominated Bolling instead of Kookinelli. What has happened here is white suburbia isn't going along with the right wing whack jobs the party has been putting up. We literally had a lt gov candidate the last time around who believed yoga leads to devil worship. The problem VA Pubs have, however, is that the strong social conservatives own the party at the grass roots level. But if they can up and realize that those type of candidates can't win statewide office, they'll likely return to routinely winning the gov's mansion and senate seats.
As for Kaine's seat, the 2 most probable replacements are Don Beyer and Bobby Scott. Scott is a nice guy, has been in the house for a long time, and the thought is he'd be better able to bring out the African-American vote in an off year. But he's also a lousy fundraiser and would be badly out-raised by his opponent. Beyer is a great fundraiser, but he's more of a meh candidate who has lost statewide election before. IOW, the Pubs have a great chance of getting that seat back if they can stay away from nominating the Kookinellis of the party. Gillispie is reportedly running for gov and won't run for that seat. If they turn to Bolling, he wins against either Beyer or Scott. As for this election, if Weld or Huntsman were the Pub nominee, either would beat Clinton here. But likely gone are the days when they could nominate folks like Gilmore and Allen and win.
The national press is really overplaying how blue VA is.