If this were Gerald Ford?
These pictures were obtained here. If Gerald Ford had hit is head, I somehow suspect that the comedians would have had a field day with it. When Ford slipped on some wet steps while deplaning Air Force One, that single incident was fodder for political comedians such as Chevy Chase for years. If George W. Bush had hit his head, I suspect that the same thing would have occurred. Remember Bush passing out because he choked on a pretzel during January 2002? There were a huge number of political jokes about it. It will be an interesting academic exercise to see how many late night jokes there will be regarding Obama hitting his head while leaving Marine One. Obama is essentially the same height as George H.W. Bush (6' 1" to 6' 2") and Ronald Reagan (6' 1").
Speaking of Chevy Chase, his recent comments about using humor on Saturday Night Live to destroy a candidate's credibility might be relevant here. When commenting on Tina Fey's portrayal of Sarah Palin he said:
"I want her to decimate this woman. This woman is, I can't believe there hasn't been more about it. ... It's just unbelievable to me this woman is actually running for vice president."
Chase also claimed that unlike other guests Lorne Michaels had nothing written for Palin when she appeared on SNL: “What was brilliant about (‘SNL’ chief) Lorne (Michaels) was that he had nothing written for Sarah . . . ."