[A very frustrating experience at the library. Found hundreds of newspaper articles including Cushings and Caseys in the Portage newspaper database at the library. I emailed all my findings to me, then find that only the titles were sent, not the text information. But, there were a few that I remember. I'll report more precisely when I go back and copy the articles.]
One of the articles reported four marriages that took place at St. Mary's Catholic church in Portage one day. Two of the brides were Cushings. One was Nellie, daughter of John, who married Dennis Callahan. The other I don't remember exactly, but married McSorley (from Texas, I believe) and was from one of the Portage or Lewiston Cushing families. The article stated that the two brides were no relation to each other, which (if accurate) answers a question we've had for many years. So our Cushings of Fort Winnebago were not, at least closely, related to the other Cushing families in Portage and Lewiston.