This isn't anything new. Feinstein was a supporter of SOPA/PIPA (Boxer as well)

Huh? Didn't Feinstein speak on the floor of the Senate 4 years ago in favor of the exact bill they just renewed?

It's either Feinstein or the GOP nominee (third parties need not apply to Congress.) If the GOP were to nominate someone I agreed with more than her, I'd vote for them. They haven't, so I haven't. The lesser of two evils, while still evil, is at least less so.

I'd vote for her too if I had to, but this wasn't a surprising move on her part.