EVERYTHING YOU NEED TO KNOW ABOUT THE APPELLATE COURT'S REASONING

"So there will be no mistake, let us be entirely clear. This court's decision is based on the following and Only On the Following: (1) what it means to be a resident for election purposes was clearly established long ago, and Illinois law has been consistent on the matter since at least the 19th Century; (2) the novel standard adopted by the appellate court majority is without any foundation in Illinois law; (3) the Board's factual findings were not against the manifest weight of the evidence; and (4) the Board's decision was not clearly erroneous."

Emphasis added by bloghost, language as found on page 21 of the Supreme Court opinion.  The link to the opinion is in "Zero Gig of Rahm" below.