Sen. Elizabeth Warren was warmly received during a visit to Hillary Clinton's campaign headquarters in Brooklyn Friday, where she gave a pep talk to staff, NBC News has learned.
"Don't screw this up," she quipped to Clinton's team, according to a source.
Many liberals hope Clinton will choose Warren as her running mate, and the visit is sure to fuel speculation about a joint ticket. It came the day after Bernie Sanders refused to concede his presidential campaign in a teleconference with supporters. Warren endorsed Clinton last week.
