One answer
If you mean, why does there seem to be more mythology about Obama than other Presidents, here are my thoughts: racism; unusual childhood (at least for a president); odd name for an American, especially "Hussein"; lack of national recognition prior to campaign for President.
Another answer
Also, since 95% of political Talk Shows on radio and about 75% on TV are hosted by Republican conservatives, the dominant discourses in the culture would be spread by people who are anti-Obama. They dislike him because he is a Democrat and they also dislike him because they perceive him as a "liberal" (which for them, means he is 100% wrong all the time).
obama, obama, obama and obama
We have 44 presidents now that barack obama
There were no black presidents before Obama!
Obama's VP was Joe Biden.
No, there are currently only 44 presidents in US history, including Obama.
Obama
Barack Obama
His legacy to president obama was that black people can go and be presidents now cause of ernest green changing the laws
Barack Obama
barack obama
Just Obama
he inspired Obama