Anybody who calls Rudy Guiliani to the carpet for using 9/11 as a political crutch is alright in my book. During the debates, Biden said "Rudy Giuliani. There's only three things he mentions in a sentence -- a noun, a verb, and 9/11. There's nothing else!"

Here is Newsweek's account of what went into the selection process. Of particular note is why Clinton was not selected.