How much weight do presidential debates carry?

hillary clinton and donald trump — taking the stage in saint louis last night. the second presidential debate — came days after a video was released of the republican nominee making sexually aggressive comments back in 2005. however — he dismissed the comments as locker room talk — also attacking clinton over bill clinton’s alleged sexual misconduct. there’s two more debates to come — with the third to take place at university of nevada, las vegas next wednesday. these debates — according to one political science expert — could carry a lot of weight to convince undecided voters — and hold on to supporters. but — it’s a two-part job. number one get those undeciders to tune in to the third debate and number two…perform in a way that will give that ‘oompth’ and put one or the other over the top as a result of that speaking of the undecided voters — how much weight do they carry in this year’s election? we’ll have that answer — coming up in the next half hour if the newshour. the launch of the antares rocket from wallops island in virginia