Why Do We Have $4 Gas?

In the latest presidential debate, there was this exchange between Mitt Romney and the president:

Gov Romney: The proof of whether a strategy is working or not is what the price is that you’re paying at the pump. If you’re paying less than you paid a year or two ago, why, then, the strategy is working. But you’re paying more. When the president took office, the price of gasoline here in Nassau County was about $1.86 a gallon. Now, it’s $4.00 a gallon.

Obama: Well, think about what the governor — think about what the governor just said. He said when I took office, the price of gasoline was $1.80, $1.86. Why is that? Because the economy was on the verge of collapse, because we were about to go through the worst recession since the Great Depression, as a consequence of some of the same policies that Governor Romney’s now promoting. So, it’s conceivable that Governor Romney could bring down gas prices because with his policies, we might be back in that same mess.

Here’s an interesting graphic that might explain the reason: