As the acceptance of the Common Core (Type "Common Core" in search bar on right of this page for previous posts) has been mostly restricted to public schools his may be a surprise to many, but for those who are familiar with the Diocese of Milwaukee, Wisconsin Diocese, this comes as no surprise.
This is the diocese that was run by the infamous and simply horrid Archbishop Rembert Weakland. This individual was reported to have paid out almost a half a million dollars to his gay lover to prevent a lawsuit and certainly allowed radical feminists to disrupt ordinations of new priests. His attempts to destroy the Church did not stop there; in the book Ugly As Sin - Why They Changed Our Churches from Sacred Places to Meeting Spaces-And How We Can Change Them Back Again, the author details the vast sums spent on tearing out the beautiful and costly features of the cathedral ( which was largely paid for by working-class Catholics) to transform the place of worship into a barren, formless, and willfully un-Catholic building. His justification for the destruction was that the features (I read the book years ago so I provide the best quote that I can now) "had no appreciable religious nor historical purpose".
The culture of this diocese is as Catholic as that of the most hyper-Liberal of Mainline Protestant or Evangelical bodies.
From Fox News-
"Milwaukee Catholic school parents blast Archdiocese's blessing of Common Core"