Missouri Ethics Commission records show the National Education Association and its Missouri affiliate each contributed $250,000 during the past week to the campaign committee opposing Constitutional Amendment 3 on the November ballot.

Those donations are on top of more than $1 million already given by the teachers union to the Committee in Support of Public Education. Other public education groups also have been financing the opposition campaign, although to a lesser extent.

The ballot proposal would require evaluations for school personnel to be based largely on student performance data.

A group sponsoring the measure has stopped campaigning for it.