Not surprisingly, teachers in Washington state don't like merit pay proposals that link pay to performance.
Teachers--it is coming. Your best bet is to get in front of the issue with a proposal that would work from your perspective, and it must link your merit pay and performance to student learning. Test scores aren't the end all, be all, but I don't think any political solution is going to completely dump test scores as a measurement.
For all my teacher readers out there (all one or two of you), if you could design a system, what would it look like?