Read the HuffPost article here
Even though there seems to be some sort of precedent with regards to the relationship between gas price fluctuation and voting tendencies, I doubt that it will play a pivotal role on the minds of voters when they head to the voting booth next year. This is partly due to the fact that in the United States, voters get to vote for the person they like, and not necessarily for the party (as supposed to Canada, where the Prime Minister is the head of the winning party).
So ultimately, the race will still come down to whether voters prefer Obama or whichever Republican candidate he will face. And in that regards, I think Obama can convincingly win his reelection any of the current potential candidates.