NEW : Obama said Clinton 's charge that fiscal responsibility is n't a priority for him `` is n't true . '' Front-runners waste no time launching new attacks . NEW : Edwards tries to stay out of heated exchange . Top two African-Americans candidates debating in Myrtle Beach , Myrtle Beach . Myrtle Beach Democratic primary is his first year .
NEW : Front-runners waste no time launching new attacks . NEW : Edwards tries to stay out of heated exchange . Top two African-Americans candidates debating in Myrtle Beach , Myrtle Beach . Myrtle Beach Democratic primary is his first year .