Campaigning in Alaska

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I recall Obama stating in his famous "57 states" speech that he wasn't allowed to Alaska and Hawaii.
That leads me to the question if any presidential candidate has ever been out canvassing in Alaska, be it for a primary or for a general election.
I mean Alaska is huuuuge, sparsely populated, far away, freezing cold; you may reckon that your jet plane will not always be able to land or take off from there. (and even if, how do you get to all those towns?)
How much would a candidate be willing to invest? How much would a campaign cost him? Which cities towns villages would he pay a visit?

In 2000, Alaska was the first state to hold a Republican caucus (along with Iowa, of course). Had any of the GOP candidates canvassed there in the run-up to the election?

Since Alaska has been trending heavily in favor of the Democrats, it will soon become a swing state. But also a battleground state?

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you'd basically be going to Juneau and nowhere else, since that's where the bulk of the population is

No, that's Anchorage. (40% of the state's total population)

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It's three electoral votes spread over an area larger than all other states. It's simply not worth it to campaign there unless its a statewide election. I could see someone hitting the major cities if it becomes a battleground, but no more than that.

That's a good question...
How many villages do statewide candidates pay a visit to?
Or do they just prowl around Anchorage and Juneau (and maybe Fairbanks)?