McGuire was born in Healdsburg, California, in 1979. He earned his B.A. in political science from Sonoma State University in 2002. In his career, he served in both the radio and television industries. McGuire was first elected to the Healdsburg School Board when he was 19. In 2004, he was elected to the Healdsburg City Council. In 2010, McGuire was elected to the Sonoma County Board of Supervisors.
