What do teachers think about our pay system?

What do teachers and the public think about having at least some of teacher pay related to student achievement?  According to an EducationNext poll:

Fifty-seven percent of the public supports “basing part of the salaries of teachers on how much their students learn,” while 31% opposes this idea. Among teachers, however, just 21% support merit pay and fully 73% are opposed.

Here is a policy paper from a group of public school teachers (part of the 21% minority) that outlines the incentive problems with step & lane.