their parents can vote with their feet....you don't enhance public education by defunding it. the glenn beck reference is pandering. my wife is a teacher of nearly thirty years in a school with wildly varying demographics. we are both registered republicans. she has never been a member of a union. i am very aware of the challenges educators face trying to educate students from wildly varying socioeconomic backgrounds. try teaching physically or emotionally abused kids. challenge a child who has no parents to pay attention. get a child to excel whose single meal is the one provided at school. now consider how could we ever fairly connect student achievement to teacher pay? you may want to turn off the tv and volunteer.
I don't know what you were suggesting at the end of that posting; but I will say I would never support merit pay based on any type of test score for all the reasons you listed.
I do think though, that there need to be programs that would get the best teachers working in the situations you described. Those children are the most at risk for being left behind and need top teachers who can try their hardest to keep the students afloat.
Although I don't support merit pay based on test scores; I do think that, if there was a way to incentivize top teachers, who are probably teaching in suburban areas, to go to urban and rural areas and work there for extra incentives, I would support that.
Overall I think it is pretty obvious why merit pay based on test scores is a bad idea: Some teachers have much tougher jobs than others so they cant possibly all be thought to have kids perform on the same level.
What I don't understand though, is how you jumped from me being for school vouchers in D.C. to me being for merit pay based on test scores.

I'd have trouble identifying a progressive country. Maybe the good old USA?? I dunno.