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By Emma Brown

From Rand Paul on the right to Elizabeth Warren on the left, members of the Senate education committee pushed aside their policy disagreements earlier this spring when they voted unanimously in favor of a bipartisan revision to the widely reviled No Child Left Behind law.

But key differences remain to be resolved in both chambers of Congress before the rebranded “Every Child Achieves Act” can make it into law. Among the stickiest: how and whether Congress should define which schools are failing to serve students well and need intervention.

It is an issue that has not only divided the parties but also pitted two traditional Democratic allies — civil rights groups and the National Education Association, the nation’s largest teachers union — against each other.

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