A question on CA, I've seen people claim the 2 party share of the vote each party gets has some predictive power in terms of how the election will go in November. That Republicans generally improve from the primary to the general in terms of the vote so any seat democrats don't win over 50% in the primary will likely vote Republican in the general. How true is this?
I agree about some predictive power, Nov results are usually in the ballpark of the party primary vote, but it's actually Republicans who never win unless they get the most votes in the primary. IIRC since Top 2 was instituted in 2012 no Republican has won a congressional race where their party did not get the most votes in the primary. There are not a lot of cases of the opposite either but it has happened.