 Of those, 159,771 (65.2%) are registered Democrats, 9,544 (3.9%) are registered Republicans, and 65,416 (26.7%) have declined to state a political party.Oakland is widely regarded as being one of the most liberal major cities in the nation.The Cook Partisan Voting Index of Congressional District 13, which includes Oakland and Berkeley, is D+40, making it the most Democratic congressional district in California and the fourth most Democratic district in the US.