Newsom won Orange County by 2000 votes. Have no idea where you got the idea the republican won, much less by 200,000 votes:
Gavin Newsom - 540,690
John H. Cox - 538,243
I mean, with it that close, it is almost unimaginable that not a single district had more republican than democrats vote for congress.
Thanks for the correction. I must have heard some early results, before all the votes were counted.