With his father being the former chairman of the state Senate Finance Committee and mentor Phillip Burton being an integral part of liberal politics in the 1970s, Miller has been described as the “heir to a tradition of Bay Area working-class politics.” Miller had one of the most liberal voting records in the House, and brings "a zest for political combat." A review of Miller's career states that, although he has been unsuccessful in his pursuit of top party positions, he has "learned a legislator’s virtues of patience, timing, and creativity."