I'd be willing to bet even 10% of people within NSA are against the current scale and scope of domestic operations of NSA. Certainly >30% of the rest of the IC, and probably >50% of DOD and non-security parts of government (random NASA guys, etc.)
To the extent that federal government employees tend to be more educated and informed (since they're professionals) than the public as a whole, employees of the federal government are quite possibly more against these programs, at least at their current scale and scope, than the general public (and certainly the voting population, who skew old and paranoid and white and rich).