LOS ANGELES — Barack Obama was standing on a riser inside a warehouse here, delivering an inspirational speech about the blessings of freedom, when his left index finger began to twitch uncontrollably, unnerving his aides. - snip - In that Hollywood building here, the life-size, three-dimensional figure was being put through its final tune-up, its chin rising and hands gesturing in response to technicians, in preparation for shipment to the Hall of Presidents exhibit at Disney World in Orlando, Fla. - snip - The public is to get its first glimpse of “Robobama,” as it is known among some handlers,...