Call it a voiceover-announcer stimulus package. Obama’s campaign and outside supporters have now spent about $352 million on ads, while Romney and his supporters have purchased $455 million in ad buys. Obama’s campaign alone is one ad away from having spent $300 million, while Romney’s camp is behind him at $164 million. Almost all the other big spenders are paying for pro-Romney ad slots, including two Karl Rove-backed groups, which have spent $124 million. Half of the ad money is going to swing states such as Florida, Ohio, and Virginia.