Yup. I live in the South. "Real Virginia", as McCain's adviser once called it. I see the Confederate Flags all the time, in peoples yards, on trucks, etc. I know people who actually think Barack Obama is a socialist muslim. There were teachers at my high school who believed in Obama conspiracy theories. At church I've heard prayers against gay people. My girlfriend's dad is paranoid and determines whether it is safe to certain cities are safe to visit or not if they have open carry gun laws. I know a lot of people who believe global warming is a hoax. This is anecdotal evidence, but I would wager that these views are rather common across the US in demographics similar to mine. These are the people who would be very likely to believe in the most of the images in this thread.
Obviously there are radical left beliefs and pseudoscientific mumbo jumbo that are very unreasonable, but it seems to me that they are much less prominent than the common right-winger who believes the President is the devil. The people I described above, however, are the GOP's base, through and through. The GOP caters to them, reflects their views, exacerbates and reinforces their beliefs. They are not a fringe group, and right wing politicians rely on them for votes. Pretty unsettling when you think of all of the crazy shit that is believed.