Reb is absolutely correct in his assessment of where Common Core came from.
It was a creation of the National Governors Association, which at the time and even today, was and is a Republic controlled entity.
https://www.nga.org/cms/home/special...ards-init.html
"The Common Core State Standards Initiative (CCSSI) is a state-led effort to establish a single set of clear educational standards for English-language arts and mathematics that states can share and voluntarily adopt."
Yes, the Obama Administration did tie-in funding to the legislation, but make no mistake, the initiative came from the States and its Governors.