Jack, you don't have to try so hard.
Anybody who chooses a rumor over the truth that disproves it because the fiction supports his own hatred-driven agenda is his own worst enemy. Deliberate cluelessness.

Once a person regurgitates that Obama smear, people see what they believe is a matter of choice and they'll lose all credibility. It's not worth arguing with people who swallow stupid shit because it plays to their hatred. Either the person knows the truth and ignores it or has "consistently failed to obtain any degree of 'clue'."