So long, John -- gas is $4 a gallon

On March 7, the average price of a gallon of gasoline in the United States reached $3.17. Four dollars a gallon by summertime is well within the realm of possibility -- even if that comes as a surprise to the current occupant of the White House. Record gas prices? During an election year? What could it mean?

Let's review the historical record.

When Jimmy Carter was sworn in as president in… » Full Story on Salon.com