Randi Weingarten was re-elected the American Federation of Teachers' by an overwhelming vote of delegates in Los Angeles.
After passionate debate, the union says it continues to support the "promise" of the common standards but wants to see changes in how they're being carried out.
The AFT wants President Obama to put his education secretary on an "improvement plan," and replace him if he doesn't change positions the union deems harmful.
The resolution adopted by convention delegates fleshes out the American Federation of Teachers' new stance on school accountability.
The union says teacher performance assessments shouldn't be standardized or "outsourced" to for-profit organizations.
AFT raises its dues; some of the new money will be put towards defense efforts.
Your guide to how the American Federation of Teachers spent some $335 million in 2012-13.
So far, it isn't clear whether the AFT will pass a similar resolution, but efforts are underway.
AFT posts new membership numbers, increasing to 1.6 million members.
AFT Innovation Fund grants will be awarded to affiliates to "critique and analyze the current standards, and/or review and comment on the research behind them."