This satellite image taken Thursday shows the oil slick in the Gulf of Mexico as it nears the shoreline, threatening wildlife along Louisiana's fragile islands and barrier marshes. NASA/AP hide caption

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Veterinarian Diane Febles (left) and her assistant, Tracey McKnight, of Veterinary Equine Dentistry work on a horse in Henry County, Ga. The silver speculum keeps the horse's mouth open and prevents the animal from biting Febles' fingers. Joanne Silberner/NPR hide caption

itoggle caption Joanne Silberner/NPR

According to the Congressional Budget Office, annual debt payments — currently about $200 billion — are set to skyrocket. CBO estimates that interest payments on the federal debt will total $916 billion by the year 2020. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images