I have written exhaustively about Obama Citizenship Denial (OCD) in another forum and under another name. I want to put a few summary thoughts here. Some links have been added in comments.
I don’t pay much attention to conspiracy theories. Conspiracy theorists view the world differently from others. Events have different causes; people have different motives. Given the huge number of people in the world, one would reasonably expect some to have fringe ideas, and some to have significant deficits in Critical Thinking. Both seem to be the case with OCD.
OCD is characterized by people believing things that are not well-documented and not believing things that are. They see everything through the filter of one thing, and so ignore all but one piece of evidence.
Part of the problem is the lawyer Philip J. Berg of Philadelphia. He filed a lawsuit against Barack Obama, the Federal Elections Commission and The Democratic National Committee with the United States District Court for Eastern Pennsylvania alleging all sorts of things including fraud, but all focusing one way or another on an allegation that Barack Obama was not a “natural born citizen” of the United States. Berg himself is a lawyer, and he should know better. The briefs Berg filed are a farce, citing as evidence the Inside Edition television program and the Italian Wikipedia. Berg makes spurious legal arguments, makes wide ranging speculation for which there is no proof, cites anonymous witnesses, and blatantly misstates the law. Some people, because this is a Federal lawsuit, believe that the facts he states must be true, and in there lies the rub.
Berg is a real piece of work and so is his lawsuit. I would not be at all surprised to see Berg disciplined for his frivolous suit, his shoddy legal work and his public lies. But whatever comes of Berg, some will believe he wrote the truth.
I have seen people who believe things for which they have no evidence besides somebody’s blog. I have seen people believe they are experts without the most rudimentary evidentiary basis.
So much time and energy wasted on this hoax.