http://www.sitnews.us/0208news/021008/021008_ak_population.html
doesnt give the whole picture. Alaska has a lot of new people coming in and out. Not as much as the 80's where a person only lived there for 5 years or less. A migrant population usually isnt interested in local politics so doesnt get registered to vote. Since Alaska is usually ignored and the polls are still open when the Presidential winner is declared a lot of folks dont bother. The older folks and the natives have a vote of over 80% of the times. The city folks range from 20% in off years to the most I have ever heard of of 43% turnout in a slobberknocker mayoral election in anchorage

as you see in the doc a large portion of the municipal population of anchorage and fairbanks is military. They may or may not choose to vote lacally, the could be more interested in voting absentee in their home races.