LOS ANGELES – After a scrappy debate that Los Angeles County District Attorney Jackie Lacey believed lifted her campaign and was a “disaster” for her opponent, she got a text message from the LA mayor with unwelcome news: He was switching his endorsement to her challenger.Eric Garcetti's defection was a blow to Lacey after other high-profile Democratic politicians had withdrawn support or switched allegiances in the high-stakes campaign that has been reshaped after a summer of protests over police brutality.The loss of support adds to a very unusual dynamic where Lacey, the first woman and Black person to run the nation’s largest local prosecutor’s office, faces some of her harshest criticism from Black Lives Matter supporters because of.