A mother and grandfather who hated America, and an upbringing in Indonesia.
He wasn't even good at pretending he cared about America before he was elected, but people wanted so badly to believe in the hologram his handlers' created that he got by with fooling more than half the country.
Yep, his mother actually sent him back to Hawaii when her Indonesian husband (Sotero) who had adopted Barry became too friendly with American oil companies he was doing business with in Indonesia. Also, if you watch Dreams of My Real Father they make an excellent case - with data - that Davis was his real father. However, Frank Marshall Davis was married and his grandfather co opted Obama, Sr. to marry her and give the baby a name, in return he was able to stay in the USA and attend Harvard. They never actually lived together.