The price of gasoline is up by an average of 30 cents since the start of the year. In parts of the country it's more than $4 a gallon, for the first time since 2008. Republicans are denouncing the Obama Administration, and the President is announcing new energy strategies. But gasoline prices go up every summer. Why? Do federal policies make a difference, whoever's in office? We talk with renowned energy expert Daniel Yergin, and get some tips for consumers on what to expect and how you can find "the lowest prices near you."