Ed Royce is a really big retirement for the Democrats. Clinton won his district by 9 points; He won by 15 points, was still considered lean R by ratings folks. Not anymore.
Unlike a lot of the Sun Belt districts, CA-39 isn't coming out of nowhere. Registration is ~R+1.5, Romney won it by 3. It's not a district where the GOP can just fall back on heavy Republican tradition
One Woman running...
Primary candidates:
Democratic Gil Cisneros
Democratic Sam Jammal
Democratic Phil Janowicz
Democratic Ted Rusk[15]
Democratic Andy Thorburn
Democratic Mai Khanh Tran
Republican Edward Royce - Incumbent
Grey Julio Castañeda (Onde)
Grey Steve Cox (Inde)
The GOP's efforts to screw wealthy blue states by curbing the SALT deduction, among other things, isn't going to help them in California, even in a reddish district.