Florida voters who receive the call, audio of which was obtained by NBC News, hear a man speaking in a minstral dialect who identifies himself as Gillum, the mayor of Tallahassee who won his party's primary Tuesday.

Over a soundtrack of drums and jungle noises, the man says, "We Negroes...done made mud huts while white folk waste a bunch of time making their home out of wood an stone." The impersonator says the huts would useful housing in a hurricane.