What is it about the price of gasoline that turns seemingly normal politicians into barking economic demagogues? When Jill puts her house on the market for $450,000 -- triple what she paid 10 years ago, but the going price in her neighborhood today -- the politicos understand that the 200 percent markup is the result of supply and demand in the real estate market. Senators don't call press conferences to denounce Jill as a profiteer. Attorneys general don't threaten to prosecute her. Governors don't compare her to looters. But when Joe's service station ups the price of gasoline by $1...