BIDEN RACKS UP MORE ENDORSEMENTS AS SANDERS GOES ON THE ATTACK IN U.S. PRESIDENTIAL RACETwo former presidential rivals endorsed Joe Biden on Friday in the latestsign that the Democratic establishment is coalescing around the former vicepresident to stop the candidacy of Bernie Sanders, who ratcheted up attackson his rival ahead of crucial contests next week.Former Massachusetts Governor Deval Patrick and John Delaney, a formerMaryland congressman - both onetime 2020 candidates - backed Biden, as did aslew of other Democratic officials in states soon to hold primary elections.Sanders, who is desperate to regain some momentum after Biden's strong SuperTuesday showing this week, launched a full-throated attack on his rival,assailing Biden over his record on trade, abortion, gay rights and SocialSecurity.The pair contest six Democratic nominating contests on Tuesday, includingthe big prize of Michigan, with 125 of the 1,991 delegates needed to win thenomination at stake.Sanders, a U.S. senator from Vermont who until recently the front-runner inthe party's race to face Republican President Donald Trump in November, nowtrails in delegates. A big win for Biden in Michigan would deliver anothermajor blow to Sanders' hopes of becoming the nominee.