(CNN) - A new Barack Obama campaign ad targeting John McCain's choice of Sarah Palin as his running mate is making buzz not so much for what it says, but for what it doesn’t.
The 30-second spot is entirely without a narrator, and instead shows John McCain's past statements appearing to acknowledge he lacks expertise on economic issues.
“I’m going to be honest: I know a lot less about economics than I do about military and foreign policy issues. I still need to be educated," McCain said in a 2005 interview with the Wall Street Journal.
A quote from McCain in a November 2007 CNN/YouTube debate is also shown, when the Arizona senator said, "I might have to rely on a vice president that I select…"
(The Obama campaign says McCain was particularly talking about relying on the VP for the economy, though McCain was describing a wide range of issues.)
A graphic is then shown displaying the question, "His choice?" - before showing Sarah Palin winking at the vice presidential debate.
The Obama campaign says the ad will air in key states.