Democrat Barack Obama lumped Republican John McCain in with the unpopular Bush administration on Friday for advancing a "naive and irresponsible" foreign policy, attempting to turn the tables in a presidential election battle in which his own national security credentials have been challenged. "If they want a debate about protecting the United States of America, that's a debate I'm ready to win because George Bush and John McCain have a lot to answer for," he declared. Obama was responding to McCain's comments that "It would be a wonderful thing if we lived in a world where we don't have enemies. But that's not the world we live in. And until Senator Obama understands that reality, the American people have every reason to doubt whether he has the strength, judgment and determination to keep us safe." Obama took on McCain a day after accusing President George W. Bush of calling him an appeaser during a trip to Israel by criticizing those who believe in negotiating with "terrorists and radicals."