Biden Decries ‘Negative Attacks’ After Sanders Airs Ads

(Bloomberg) -- Democratic presidential candidate Joe Biden on Wednesday urged his opponents to keep the race positive as it intensifies, an implicit rebuke of Bernie Sanders’s aggressive response to the former vice president’s Super Tuesday victories.“What we can’t let happen is let this primary turn into a campaign of negative attacks,” Biden said in a brief statement to reporters in Los Angeles. “The only thing that can do is help Donald Trump and it doesn&r