I am keeping the diary here solely to preserve comments. The front page has a more thorough update.
CNN is reporting that Sen. Johnson had "successful" brain surgery for a condition known as arteriovenous malformation, which causes arteries to grow to abnormal size.
The story is in the "developing" banner and has not been incorporated into the lead story on the front page.
I am assuming from this brief information that he is going to be OK. Keep those prayers, chants and good thoughts coming, people.
I will delete this as others post more complete info.
Update: cadejo4 has a link in a comment below to an AP story with more info. I cannot access the page, for some reason, or would provide the link here.