Politico: California 39th congressional district is a toss-up

Open seat.  Republican Edward Royce is retiring after serving 13 terms in the U.S. House

POLITICO race ratings: 60 GOP House seats in danger.  (Politico, 9/5/2018)

Source:  Ballotpedia

Most definitely not Trump country.  He received a smaller percentage of the votes than Romney and McCain.
Trump received 42.9% of the vote in 2016 compared to 50.8% for Romney in 2012 and 49.0% for McCain in 2008.

Clinton received 51.5% of the vote in 2016 compared to 47.1% for Obama in 2012 and 47.0% for Obama in 2008. 

Source:  govtrack

Other U.S. House 2018 election outlooks:
Martha McSally, Arizona 2nd.  (10/8/2017)

Jeff Denham, California 10th.  (10/9/2017)
David Valadao, California 21st.   (10/10/2017)
Steve Knight, California 25th.  (10/11/2017)
Ed Royce, California 29th.  (10/12/2017)
Mimi Walters, California 45th.  (2/12/2018)

Scott Tipton, Colorado 3rd.  (9/1/2018)

Dennis Ross, Florida 15th.  (4/12/2018)
Brian Mast, Florida 18th.  (10/13/2017)
Carlos Curbelo, Florida 26th.  (10/14/2017)
Florida 27th.  (8/31/2018)

Peter Roskam, Illinois 6th.  (9/1/2018)
Mike Bost, Illinois 12th. (10/15/2017)

Rod Blum, Iowa 1st.  (2/12/2018)
David Young, Iowa 3rd.  (9/2/2018)

Kevin Yoder, Kansas 3rd.  (10/16/2017)

Andy Barr, Kentucky 6th.  (2/12/2018)

Mike Bishop, Michigan 8th.  (2/12/2018)

Jason Lewis, Minnesota 2nd.  (7/18/2018)
Erik Paulsen, Minnesota 3rd.  (10/17/2017)

Don Bacon, Nebraska 2nd.  (10/18/2017)

Tom MacArthur, New Jersey 3rd.  (10/19/2017)
Leonard Lance, New Jersey 7th.  (2/14/2018)

Lee Zeldin, New York 1st.  (2/12/2018)
John Faso, New York 19th.  (2/12/2018)
Claudia Tenney, New York 22nd.  (10/21/2017)
John Katko, New York 24th.  (2/12/2018)

Steve Chabot, Ohio 1st. (2/12/2018)

Ryan Costello, Pennsylvania 6th.  (10/23/2017)
Pennsylvania 7th.  (8/29/2018)

Will Hurd, Texas 23rd.  (4/15/2018)
Pete Sessions, Texas 32nd.  (4/15/2018)

Scott Taylor, Virginia 2nd.  (8/28/2018)
Disgraced Tom Garrett.  Virginia 5th.  (9/2/2018)
David Brat, Virginia 7th.  (9/2/2018)

West Virginia 3rd.  (8/28/2018)