ATLANTA — Georgia Republican Senate candidates Jack Kingston and David Perdue sharpened their attacks on each other during a heated debate Sunday with just over a week to go before their runoff election. Perdue, the former CEO of Dollar General and Reebok, repeatedly blasted Kingston, an 11-term congressman, as being part of the problem in Washington and failing to take action to cut spending, reduce the federal debt and turn back bad regulations. "We've become less and less competitive on this congressman's watch," Perdue said.