Obama TV Ad Questions McCain's "Choice" for Veep

The latest spot uses Palin against McCain, reprises remarks he made about a year ago suggesting he doesn't understand the economy as well as he should. Quotes him as saying "I might have to rely on a vice president that I select" for expertise on economic issues, then shows footage of Palin winking. Ad contains no narration, just light music and type on the screen. Watch it above. Campaign says ad "will begin airing in key states across the country tomorrow." Amount and length of buy TBD. Read McCain camp response here.