I was looking at various US Presidents on Wikipedia. I note that every President from Herbert Hoover to George W Bush had their pages edited on 28 Dec 2006 (UTC).

Going back from the present, Calvin Coolidge is the most recent president with no edits on the 28th.

Poor Silent Cal.

(I do note however that in the last week, he did get 8 edits, so that is something at least.)