Coyote Blog via Instapundit: "Assuming Cheney does not want to run for president, which I think is a given, something will happen in 2008 that has not happened in 56 years since 1952: Neither of the two major-party presidential candidates will be incumbents of the President or Vice-President jobs."

Except that, as a commenter on the post says, Cheney might be replaced before 2008, & then an incumbent VP (Guliani?) could run.