nbc's chris jansing is live inside the debate hall with what we can expect in las vegas tonight. hi there, chris. >> chris. >> reporter: no pressure. only 60 million plus people could be watching at home if past the prologue. last couple of debates got those numbers. the set is probably familiar to you, tamron. this is the same one used in the other two debates. similar set-up to the first one. you will have hillary clinton on the right which means that her family is going to be sitting here in line of sight. donald trump on the left. this is where he will be sitting about ten minutes from now they will do a check rehearsal. these are the folks who have been playing donald trump, hillary clinton and the moderator. they will check the lighting, sound. less than 300 people actually get tickets for these seats. this is the biggest live audience they have had. look up there. folks watching the rebels play basketball normally.