NORTH CHARLESTON, S.C. (AP) — Bernie Sanders is going after Joe Biden, warning that a “conventional campaign” like the former vice president’s won’t defeat Donald Trump.  Speaking at a rally in North Charleston, South Carolina, Sanders called out his opponent by name, knocking Biden for voting for “terrible trade policies like NAFTA” and the Iraq War. Sanders and Biden are vying for an edge in South Carolina. While Biden remains in the lead in surveys of the state and said during Tuesday night’s debate he plans to win the primary, Sanders has been gaining ground after a series of wins across the three previous primary states. In North Charleston on Wednesday, Sanders told the crowd he will win South Carolina.