Click here to watch "Tiny."

John McCain's camp is keeping a close eye on the Democratic convention schedule, coordinating its attack ads with speakers and topics. Tonight’s convention focus is national security, and McCain’s new spot hits Barack Obama where it may hurt the most: his foreign policy credentials, or, as McCain argues, the lack thereof.

"Tiny" (subscription) uses statements Obama made at a rally in May to assert that the Illinois senator doesn't think Iran is a serious threat. "Obama says Iran is a 'tiny' country, 'doesn't pose a serious threat.' Terrorism? Destroying Israel? Those aren't 'serious threats'?" the announcer chides. Reiterating McCain's attack staple that his opponent doesn't have the experience needed to lead, the ad concludes: "Obama: dangerously unprepared to be president."

This is the latest of several ads the campaign has recently released -- one every day of the Democratic convention. Indeed, it was no coincidence that the GOP released two ads portraying Hillary Rodham Clinton in a light favorable to McCain and unfavorable to her own party's candidate on Tuesday -- when she delivered a speech urging her millions of supporters and attending delegates to rally behind Obama.