Sigh - this commercial's song snippet is by Cat Power. Period. Not INGRID MICHAELSON or anyone else. Ingrid my sing it on MySpace, Facebook, Youtube, in the shower, while taking a dump, whatever ... but Cat Power walked out of DeBeer's ad agency with cash in hand for the commercial spot.
Everyone can stop hunting for Cat Power "Full Version" cuts of the cover songs HOW CAN I TELL YOU and SPACE ODDITY done for commercials - Chan Marshall only did a 30 second bit piece for each and has said countless times she's not doing full versions. Yes, there's a demand for them but as anyone who follows Cat Power knows, she's (to put it politely) weird in that way. :^) Unlike Shiny Toy Guns, not every cover Cat Power does is a full song.
If you still doubt any of this, go ask Chan herself.