Political party strength in Alaska has varied over the years. The communities of Juneau, Sitka, downtown and midtown Anchorage, the areas surrounding the College/University of Alaska Fairbanks campus and Ester and the "Alaska Bush" – rural, sparsely populated Alaska – stand out as Democratic strongholds, while the Kenai Peninsula, Matanuska-Susitna Valley, parts of Anchorage, and Fairbanks (including North Pole and Eielson Air Force Base), Ketchikan, Wrangell, and Petersburg serve as the Republican Party electoral base. As of 2021, over half of all registered voters have chosen "Non-Partisan" or "Undeclared" as their affiliation, despite recent attempts to close primaries.