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january 6 case looms in washington and that classified documents case as well among a myriad of other challenges. norah. >> norah: robert costa at the trump party in des moines, nikki haley and ron desantis have been neck and neck with the poles with nikki haley pulling ahead in the final days. the big question is where each candidate ends up in the final vote count with these caucus goers. let's bring in cbs's ed o'keefe who has been on the ground in iowa covering both campaigns. good evening, ed. >> reporter: norah, good evening. donald trump maintained his edge in iowa throughout, we met plenty of voters who prefer nikki haley or ron desantis. the two have spent plenty of time and tens of millions of dollars attacking each other's figuring out if they can get out of iowa, then they can turn their attention to the front runner. >> how are you, good to see you? >> reporter: despite the bitter cold, nikki haley and ron desantis trying to turn up the heat on their campaigns. both looking to make up ground. >> we have spent the last 11 months all over the state talking to everyone. >> i've never seen so much energy than what we have seen over the last few days. >> reporter: the two made a