Rep. John Boehner writes here:
"Since Democrats took control of Congress in January 2007, the energy crunch has been swift and severe. Gas prices have risen from an average of $2.33 per gallon in the first days of the Democratic Majority to $3.78 per gallon today, while diesel prices – particularly important for school transportation purposes – have risen from $2.44 per gallon to $4.47 per gallon today. No matter how you slice it, the surge in energy costs has been dramatic, and with fall and winter right around the corner, the pain will not just be felt at the pump, but in heating bills as well."
So the cause isn't speculators, increased consumption, disruption of supplies, or any of those things... it's Democrats!