The siege at Khe Sanh was an epic episode in the history of warfare where American troops held off vastly superior forces. The word 'Khe Sanh' has been repeated thousands of times in our media. Anyone that is remotely conscious has to have heard it several times in a lifetime. Apparently this president, who many have claimed is smarter than Jefferson, Lincoln, Washington, the most intelligent president ever, apparently has not been quite so conscious. I doubt that Reagan or Bush would ever have made this gaff. It is like pronouncing Gettysburg as Gettlingburg.
Of course Obama is the most brilliant president to some, those who are less intelligent than he is and that is not much of an accomplishment.