north charleston s.c. republican presidential front-runner donald trump top challenger ted cruz end longstanding truce spectacular fashion thursday night bitter exchange may trump strong debate performance date new york billionaire texas senator appear split decision end night sign bluster little take place could derail trump lead position contest iowa feb. begin search republican presidential nominee projections debate would free-for-all accurate beyond trump-cruz theatrics u.s. senator marco rubio florida turn pugnacious performance attack cruz new jersey governor chris christie florida governor jeb bush present voice reason trump google snap poll show viewers believe trump recent debate time less engage night 37.3 percent cruz 26.6 percent rubio 12.1 percent fox business network debate north charleston south carolina trump cruz friendly chase conservatives tea party movement want anger trump need fend cruz rise iowa push charge cruz may constitutionally qualify serve president bear canada u.s. constitution say natural bear citizens become president unite state hell know even serve office trump tell cruz draw scatter boo audience bear calgary alberta u.s. citizen mother cuban father cruz accuse trump bring birthplace simply cruz lead poll iowa cruz say trump lead movement question whether hawaiian-born president barack obama really unite state ask lawyers look issue cruz birth september conclude issue since september constitution change poll number cruz say recognize donald dismay poll number drop iowa facts law really clear trump say democrats would sue cruz republican ticket put party chance win risk cruz shoot back spend many years study constitutional law go take legal advice donald trump birthright issue dog american politics 2008 republican nominee john mccain survive question birth panama bear u.s. military installation judge u.s. soil 1967 republican candidate george romney face question birth mexico candidacy never advance far issue abandon cruz seem parry attack sting trump another issue whether people live new york city value americans cruz lately begin denounce new york value connect trump city famous liberalism everyone understand value new york city socially liberal pro-abortion pro-gay marriage cruz say trump perhaps heartfelt remark night hark back new york response sept. 11 2001 attack defend home city people new york fight fight fight saw death even smell death ... us months smell air rebuild downtown manhattan everybody world watch everybody world love new york love new yorkers tell insult statement ted make trump say rubio third place behind trump cruz iowa hop strong outcome help new hampshire primary feb. frequently insert arguments try put pressure cruz accuse cruz propose value add tax part tax plan soft immigration consistent conservatism say political calculation attack christie well accuse liberal position education policy abortion christie interrupt rubio-cruz exchange blast like interrupt debate floor senate chance marco blow say cruz take lead poll iowa republican voters well social media social media monitor tool zoomph saw total positive mention cruz climb 150 percent spar trump trump far ahead nationally reuters/ipsos roll national poll jan. 12 show trump 39 percent vote cruz 14.5 percent bush 10.6 percent carson 9.6 percent 6.7 percent favor rubio 2016 presidential race see reuters blog tales trail paragraph correct fox business network fox business channel friendly trump cruz erupt bitter fight republican debate