I agree with Bee's points (and a few others above) - your blog is the thing that should get you the job (in any sane world, anyway). In a sense you are ALREADY doing a great PR job for the service, and I had no idea of what your job was actually like until I found this place. Only you can know whether you'd be able to walk the line and keep things honest, even if it meant losing the job: and whether it would be possible to work this into the job specs, I can't say. Maybe it's not about turning the job down for the blog per se, but about turning it down because you sense that it would limit your freedom of speech, and ultimately even your freedom of thought, and of conscience?