DES MOINES, Nov. 24 — It may be called the Case of the Disappearing Pause. When President Bush laid out the potential threat that unconventional weapons posed in Saddam Hussein's hands last year in his State of the Union address last year, he became tongue-tied at an inopportune moment. The line read, "It would take one vial, one canister, one crate, slipped into this country to bring a day of horror like none we have ever known." But Mr. Bush stumbled between the words "one" and "vial." And when at the word vial, he pronounced the "v" as if it...