I think I may have found what POTUS was holding up at the church.
= THE LBJ MISSAL ==
Mystery of a famous missal
In the harrowing and chaotic hours following the assassination of President John F. Kennedy, the hastily arranged inauguration of then-Vice-President Lyndon B. Johnson was conducted aboard Air Force One. The impromptu inauguration may or may not have had the blessing of attorney General Robert Kennedy, a bitter LBJ political rival who was in the early grieving stages over the loss of his brother.
Johnson had been rushed to the presidential aircraft immediately after the assassination amid fears of a potential greater conspiracy, a theory that continues to spark heated debate more than 50 years later. Rather than departing immediately, however, Johnson insisted on waiting for the arrival of Kennedy’s wife, Jacqueline Kennedy, as well as the coffin carrying Kennedy’s body. Johnson also called for Judge Sarah Hughes from Dallas to administer the presidential Oath of Office.
http://thecatholiccommentator.org/pages/?p=26897
I don't think it was the exact missal, but instead justAcatholic missal, but I could be wrong… the coloring is right and the size.
Make what you will of it though…