In some parts of the country, like San Diego (above), gas prices are above $4 a gallon. Some Republicans are trying to tie those higher prices at the pump to President Obama's energy policies. Gregory Bull/AP hide caption

itoggle caption Gregory Bull/AP

Huge tanks help house the oil surplus in Cushing, Okla. Each tank holds more than 250,000 barrels of oil. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

Spent nuclear fuel rods are stored in pools of water at Japan's Fukushima Dai-ichi nuclear power plant. The water keeps the rods cool while protecting the environment from their radiation. Jiji Press/AFP/Getty Images hide caption

itoggle caption Jiji Press/AFP/Getty Images

In Colorado, yellow warning poles designate the underground path of a gas pipeline. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

Drivers in the middle of the country have gotten a break on gas prices because of bargain-priced oil coming in from Canada. Monika Wisniewska/iStockphoto.com hide caption

itoggle caption Monika Wisniewska/iStockphoto.com

A cargo ship transits the Suez Canal en route from the Mediterranean Sea to the Gulf of Suez at the city of Suez, Egypt, on Wednesday. Emilio Morenatti/AP hide caption

itoggle caption Emilio Morenatti/AP

President Obama hugs NASA astronaut Mark Kelly, husband of Rep. Gabrielle Giffords, during a ceremony last week in Tucson, Ariz. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

Emergency personnel work on Jan 8 at the scene where Rep. Gabrielle Giffords, (D-AZ) and others were shot outside a Safeway grocery store in Tucson, Ariz. Nearly anyone at the scene that day will be at risk for post traumatic stress disorder, but it's difficult to predict who will be affected. Matt York/AP hide caption

itoggle caption Matt York/AP