I just saw the ad. It's fairly effective, but nothing more. It shows Biden commenting on Obama's readiness, but it clearly shows it during a Primary Debate which takes away from it's impact. Obama's inexperience is also not exactly breaking news. It also shows his comment about "serving with McCain", but the exact quote is "I'd be honored to run with or against John McCain". Again, not much of an impact to me. Biden and McCain are known good friends