You seem to rely heavily on mainstream media coverage of an issue rather than the facts and evidence surrounding the issue. Strange considering your tag line: (The Mainstream Media — IGNORANCE ON PARADE)
The fact remains, nobody was blowing any warning whistles about Obama's father not being a US citizen. Evidently, nobody of any authority or prominence or expertise was disturbed that this might affect his qualification for the office of the President.
Nor was Obama, or anybody else, trying to hide this fact.
There were (virtually) no warnings reported in the mainstream media prior to the election; nor was it reported in the conservative media; nor was it reported in the alternative media.
Indeed, the possibility that Daddy not being a US citizen might disqualify Obama seemingly wasn't "discovered" until around 2010 -- which makes me suspicious about who it was who was promoting the idea.