Commentary California desperately needs a two-party system. As R Street Institute Western Regional Director Steven Greenhut recently pointed out, the state’s poor quality of leadership largely is due to this being “a one-party state, where internal party considerations matter more than policy credentials or basic competence.” A new Berkeley IGS Poll of the state’s registered voters shows Californians are starting to get fed up with the one-party dominance and lack of choice. Released Feb. 15, the poll shows Gov. Gavin Newsom’s poll numbers dropping sharply the past 17 months. He went from 64 percent approval in Sept. 2020, to 50 percent in September 2021, finally down to 48 percent in the new poll. His disapproval correspondingly has risen, from just 36 percent in Sept. 2020, to 42 percent in Sept. 2021, to 47 percent now. The latter is about equal to his 48 percent approval. Not surprisingly, in the new …