JEFFERSON CITY, Mo. (AP) – Missouri could become the first state to tie student learning to teacher evaluations in its state constitution, if enough voters support a November ballot issue.

Proposed Constitutional Amendment 3 would require a majority of teachers’ evaluation scores be based on objective student performance data, which could include standardized tests.

The measure also would limit future teaching contracts to three years, ending the current tenure system that gives teachers indefinite job security after five years.

The group sponsoring the initiative recently announced that it won’t be campaigning for the measure, after public opinion polling showed a lack of support.

But some education groups still are campaigning against it. They say it could lead educators to “teach to the test.”