Daniel Weinberg, the owner of the Abraham Lincoln Book Shop in Chicago, is in possession of a picture showing Lincoln with a housefly on him.
He, however, does not know whether Lincoln also killed the fly or not.
It may be recalled that Obama swatted a fly during a television interview earlier this week, and killed it in just one attempt.
Weinberg jokily said that Lincoln might have let the fly off scot-free, and thus would not have left the People for the Ethical Treatment of Animals (PETA) upset.
Activists attached with the animal rights group have announced they are sending Obama a contraption that traps but does not kill bugs, apparently as a token of their protest.
"He (Lincoln) was the great pardoner," Fox News quoted Weinberg as pointing out.
He revealed that the picture was clicked in Alexander Gardner's Washington, D.C. photo studio, when Lincoln went there to sit for a photographic portrait in Aug of 1863.
Weinberg thinks that Lincoln would have remained absolutely still for such a picture at the time-if he had moved to swat the fly, it would have caused the photo to blur.
Thus, he believes that Lincoln would have kept his hands where they were so as to have a quality photograph, and would not have done what Obama did.