On the hierarchy of endorsements, that makes them pretty low key.
Moore went a little further than Perdue, with his wife, Noel, giving a donation as well.
Farther up the hierarchy: Sending a targeted mailing to certain regions or demographic groups, sending a wider mailing, holding a press conference to announce an endorsement and stumping for the candidate.
Former Gov. Jim Hunt and then U.S. Sen. Terry Sanford, for example, held a press conference to announce their support for Al Gore in the 1988 primary.
But neither was up for election. Both Perdue and Moore are trying to thread the needle by gaining the benefits of endorsing Obama without drawing the ire of Hillary Clinton supporters.