I believe in a dream that we are ONE world and with Barack Obama it is no longer only a dream.

“Televised to the nation, the “We Are One” Opening Celebration is a declaration of common purpose and new beginnings. Today’s performance will be grounded in history and brought to life with entertainment that relates to the themes that shaped Barack Obama and which will be the hallmarks of his administration.”Barackobama.com 

It is an historical moment, also that they use a brand as Hallmark to describe it.