charleston s.c./manchester n.h. flare temper sharp elbow may turn debate seven republican presidential candidates seven-car pileup thursday tensions donald trump rival ted cruz lead way sixth republican debate north charleston coliseum swing state south carolina take place tense time republican field clock tick toward feb. iowa first contest race choose party nominee nov. general election everybody avoid make mistake say david yepsen director paul simon public policy institute southern illinois university mess something debate go almost opportunity correct it p.m. est debate feature top seven candidates rank republican voters new york real estate businessman reality tv star trump texas senator cruz florida senator marco rubio retire neurosurgeon ben carson former florida governor jeb bush new jersey governor chris christie ohio governor john kasich nearly every candidate bone pick one others week beyond trump-cruz theatrics bush blast trump rubio rubio slam bush well cruz christie christie attack everyone else fox business channel moderators neil cavuto maria bartiromo focus dispute debate could one lively series whether bicker help questionable think republicans stop beat let opponents democratic party say republican voter j.p. marzullo deering n.h. front-runner trump put cruz main obstacle iowa victory defensive suggest cruz may qualify candidate bear canada u.s. citizen mother cuban father change posture trump issue however say interview abc news last september hear lawyers believe problem cruz trump cruz friendly past year target trump new position cruz take lead poll iowa republican voters part avoid tangle trump reuters roll national poll jan. 12 trump 39 percent vote cruz 14.5 percent bush 10.6 percent carson 9.6 percent 6.7 percent favor rubio view republican establishment many donors rise star cruz tell reporters new hampshire tuesday trump rely judgment birthright question harvard law professor laurence tribe cruz describe liberal left-wing judicial-activist supporter democratic party front-runner hillary clinton past couple elections saw democrats thrill get nominee want run general election seem hillary folks eager support donald trump cruz say trump prove master find perceive weakness opponent insist cruz canadian birth violate u.s. constitution requirement native-born americans president sadly way ted cruz continue run republican primary unless erase doubt eligibility dems sue tweet wednesday mudslinging abound elsewhere field group candidates fight alternative trump battle national security immigration give attack take place counter attack think lively debate see point say eric fehrnstrom top adviser 2012 republican nominee mitt romney donald trump still complete command race still become main challenger 2016 presidential race see reuters blog tales trail trump cruz tensions may provide lively republican debate yet