Obama Camp Adding Georgia, North Dakota, Arizona to Ad Buy

Campaign manger Plouffe says on a media call Friday they're expanding their advertising in the final days, including into McCain's home state of Arizona.

Read release on the ads here.

Touts positive early voting stats, says it looks like McCain will "not only have to carry the day but carry it convincingly" to win on Election Day.

Also predicts it will be a "ferocious" last four days.