Missouri Education Commissioner Chris Nicastro said she did nothing improper in reviewing and making recommendations about a 2014 ballot initiative's language.
An organizer of the protest day against common core says her work is just beginning, while a "Moms Against Duncan" group recently started.
Florida superintendents have also requested a three-year delay in common-core implementation, but that state's school board doesn't appear sympathetic to the idea.
A lawsuit challenging the validity of common core has been filed in Kentucky, while state chiefs continue to grapple with public perceptions of the standards.
The lawsuit filed against the department by plaintiffs in the Empire State says the group's data cloud puts private student information at risk.
Superintendent Glenda Ritz objected to another state agency, created by Gov. Mike Pence this year, potentially taking control of common-core review away from her department.
California state board members have asked for revisions to draft regulations governing the state's new K-12 funding plan following criticism from several groups.
Nov. 18 has been identified by some common-core opponents as an "opt out" day, while an Illinois senator has proposed delaying the standards in his state.
Illinois Gov. Pat Quinn has picked former Chicago public schools CEO Paul Vallas to be his running mate as lieutenant governor in 2014.
Several states where 2013 National Assessment of Educational Progress scores showed no statistically significant improvement chose to focus on how their students performed against national averages.