Why do people think Obama has anything to do with gas prices?

How can anyone suggest that Obama has any control over gasoline prices whatsoever? This seems like a laughable proposition to me, yet some people seem to think there is a direct link between the current president and the price of gas. Do people think he has an app on his phone that lets him change the price of gas as he pleases? And really...why the hell would he want to raise it anyway? Will someone please explain to me why anyone would think this?