On surveillance? They do. High-profile Democrats consistently talk about privacy advocates and encryption developers/users as threats to the security of the country. This is my point - surveillance is perhaps the most nastily bipartisan issue going.

More broadly: I absolutely support primary challenges from the outside. But I see no particular reason to pretend that Feinstein is any more open to change stance on this issue than your conservative of choice; if anything she's more unapologetically pro-surveillance than Republican moderates like McCain.