Typically, you now see every reason under the Sun espoused by so-called pundits as to why Rudy Ghouliani's candidacy died — except the most probable reason:

The effect all of the 9/11 Truth and Justice Movement activists made as they dogged Rudy from venue to venue, city to city, state to state, pointing out why he should not be considered. (and pointing out all of his flaws, lies, asininities, etc., as well)

Not to mention all of the extensive online truthination on top of it.

He never had a chance.

Good job people.

Never doubt that a small group of thoughtful, committed citizens can change the world.
Indeed, it is the only thing that ever has. — Margaret Mead U.S. anthropologist & popularizer of anthropology (1901 - 1978)

(in other news, John "Cut & Run" Edwards is a sell-out bastard who traded for a probable Vice-President offer from Obama and/or Hillary, the NeoRepCon (anti-) election fraud machine is in high gear ensuring Hillary beats out Obama so that whichever NeoRepCon candidate runs against her automatically wins, and Ron Paul, as much as I dislike him, also got screwed (+/-) by his own kind (+/-) via that same election fraud machine — ain't Life grand?)