Warren, Sanders, Yang Threaten to Skip Debate Over Union Dispute

(Bloomberg) -- Three Democratic candidates say they will skip the Democratic debate next week if food service workers at the site carry through with a promised picket line.Senators Elizabeth Warren and Bernie Sanders and entrepreneur Andrew Yang all tweeted Friday that they will not show up for a debate at Loyola Marymount University in Los Angeles on Thursday.The debate had been slated for UCLA’s Luskin School of Public Affairs. But the DNC asked the debate’s media sponsors to find