The approval ratings don't lie - Trump is an extremely unpopular President, and he cost his party dearly yesterday.
What we're seeing today is just spin. By reading some of the posts here, I would think that VA was NYC, and solid left-wing territory. Many who were predicting a Gilly win or nailbiter are now playing it off and trying to say that he shouldn't have distanced himself from Trump and that it's no big deal that "a Dem won a Dem state".
The margin ended up bigger than even the most optimistic lefty would have guessed, and the other races added everything up to a much more ominous signal for the GOP. And if you read into some of the exit polls, the future looks even worse - voters under 45 went overwhelmingly Democrat.
Careful what you wish for: you wanted Trump to wreck the party, and he's doing it.