Conversation so far:
Who were some of the members that were invited for a special screening?
Dixon arranged a screening of The Birth of a Nation at the White House for Wilson, members of his cabinet, and their families.
Was there anything surprising about this viewing?
Wilson was falsely reported to have said of the film, "It is like writing history with lightning.
And my only regret is that it is all so terribly true".
Did any other political parties view it?
Dixon persuaded all nine justices of the Supreme Count to attend a screening of The Birth of a Nation as well as many members of Congress.
Are there any other interesting aspects about this article?
the President was entirely unaware of the nature of the play before it was presented and at no time has expressed his approbation of it.

Question: why was he approbation about?
Self-contained rewrite: why was the President approbation about The Birth of a Nation?