NEW : Front - runners waste no time launching new attacks . NBC : Edwards tries to stay out of heated debates . Discussions about proposals on the economy and health care were overshadowed by heated exchanges between rivals Hillary Clinton and Barack Obama during Monday night 's Democratic debate . Top two Democratic candidates debating in Myrtle Beach , South Carolina . South Carolina 's Democratic primary is Saturday .
NEW : Front - runners waste no time launching new attacks . NBC : Edwards tries to stay out of heated debates . Top two Democratic candidates debating in Myrtle Beach , South Carolina . South Carolina 's Democratic primary is Saturday .