Original newspaper caption (from Shorpy.com):
News item, Jan. 20: "The first organized touring Coolidge Marching Club to work for the nomination of the president comes to Washington Sunday morning. It is composed of 25 European midgets, headed by I.S. Rose, New Englander and impresario. The midgets wear buttons and ribbons on which is inscribed 'Coolidge 1925.'"
Finally we know... Calvin Coolidge was in the pocket of "big midget".