Oil prices

Some people in the oil business, including the Koch brothers, are:
Funding organizations that are manipulating public opinion to doubt global warming exists and is at least partly caused by human activity.
Trying to get school systems and textbook publishers to claim that man-made global warming is "controversial" among scientists, when in fact at least 97% of climate scientists believe it is true.

So they would have no qualms about raising the price of oil in order to make President Obama look bad, and blaming it on Obama. Whether they have done this, I have no way of knowing. This kind of thing often takes a long time to come to light.

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