From McCain campaign manager Rick Davis's campaign memo just out this evening, discussing why Obama's decision to run ads in Georgia, Arizona and North Dakota is a sign the McCain camp has him on the ropes ...

Expanding the Field: Obama is running out of states if you follow out a traditional model. Today, he expanded his buy into North Dakota, Georgia and Arizona in an attempt to widen the playing field and find his 270 Electoral Votes. This is a very tall order and trying to expand into new states in the final hours shows he doesn't have the votes to win.

Translation: The fact that Arizona has moved into the toss-up column is a devastating development for Obama.

(ed.note: When I saw the Davis memo pop into my inbox this evening, I didn't have the heart to read it. But TPM Reader DMR flagged this little morsel for my attention.)