Associated Press: President Barack Obama said Tuesday that the Gulf of Mexico oil spill is a reminder that the economy, which is showing signs of recovery two years after the recession, can be walloped at any time by a sudden and costly crisis. Obama told a group of business leaders that dealing with the spill and its fallout will be a significant challenge, and pledged to continue exploring all options for replacing fisheries and tourism jobs now threatened by the growing oil slick. “We are …