ATLANTA — Democrat Michelle Nunn of Georgia is out with another ad showing her with former President George H.W. Bush, who's asked her not to use him in her campaign for the state's open Senate seat. Nunn's latest TV ad pushes back at attacks by Republican opponent David Perdue, who has used a photo of her with President Barack Obama to show she would support the president's agenda. In the new ad, Nunn says Perdue fails to mention the photo was taken at an event honoring the 41st president and shows she can work with both Democrats and Republicans.