If it's pretty clear then you no doubt have tons of evidence supporting your claims. How about letting us in on some of it?
You forget that his family covered all this up while he was still a child to preserve his eligibility for the presidency.
To hold this opinion one must work to avoid noticing the insanity of thinking that anybody in 1960s Hawaii would have considered a half-black kid a likely candidate for that particular office. BTW, president and vice-resident are the only offices in the USA that require a citizen to be native-born as opposed to naturalized.