martha raddatz. pgiving us a sneak peek tonight. p>> hey, good evening. pthe excitement is mounting here pat st. anselm college in pmanchester, new hampshire, as pour abc news crew is putting the pfinishing touches on our debate pstage. ptop three candidates -- donald ptrump, ted cruz, marco rubio -- pwill be taking center stage here ptomorrow night and if there's pone thing we can count on it's psome heated exchanges. pall the candidates are gunning pfor momentum. pjust ahead of the crucial new peverybody wants to make their pmark, survive this debate, and pmove forward. pbut it may be the last chance pfor some. p>> thank you, martha. pmartha and david muir will pmoderate that debate tomorrow pnight at 8:00 eastern, 7:00 pcentral time, right here on abc. pit was former president george ph.w. bush who said, if anyone ptells you america's best days pare behind her, they're looking pthe wrong way. pthank you for watching abc news. ptune into "good morning america" ptomorrow. pas always we're online on

p>> i'm all over it, david muir pand martha raddatz will be pmoderating tonight's debate. pthey've got a preview now from pthe debate hall. p>> hey, dan and paula, good pmorning. pwe're hours away from the seven pgop candidates taking the stage pright here behind martha & me in pmanchester, new hampshire. p>> and donald trump will be at pthe center because he is the pfront-runner based on polling, pcruz and rubio will be on either pside of him and that's the top pthree. p>> but there's going to be a lot pof focus on the other four, pcarson, kasich, christie and pbush looking to survive the race pso they'll make their case pcertainly to voters right here pin new hampshire to try to pchange the course of the race. p>> anything can happen so join pme and david only on abc here plive in new hampshire, we'll be pasking the questions and it all pstarts at 8 p.m., 7 central. psee you tonight. p>> looking forward to that. panything can happen, anything pwill happen tonight. p>> absolutely. p>> we want to thank david and pmartha and they're certainly pgearing up for what will be a