DENVER, Colorado (CNN) -- Democratic presidential nominee Barack Obama laid out his credentials to take on and beat Republican candidate John McCain in the fall election. Obama compared himself to McCain on domestic and foreign policy in an impassioned speech before a cheering crowd at the Democratic National Convention Thursday. "If John McCain wants to have a debate about who has the temperament, and judgment, to serve as the next Commander-in-Chief, that's a debate I'm ready to have," he said. ...