Democrats privately worry the Teamsters non-endorsement is a warning sign POLITICOLocal Teamsters groups announce Harris endorsements after national union declines to do so NBC NewsThe Reason This Union Gave for Not Endorsing Harris Is Shocking. But It Makes One Thing Clear. SlateTeamsters president shrugs off AOC's criticism for not endorsing Harris, tells her to 'focus on her job' Fox NewsFormer Teamsters leader criticizes non-endorsement of Harris for president The Washington Post