This chart is sadly out of date by now. The cheapest Arco station near me has just dropped two cents to $4.359 from a high of $4.599 not too long ago. I haven't seen a "3" at the start of a gas price in way too long.
Bottom line: The Democrats want you to keep paying higher gas prices. The Republicans want to bring the gas prices down. If you have a gas tank that needs filling up once in a while, then let your vote reflect which side of the gas price question you're on.