I wouldn't call that a landslide!  She only got 44% of the vote.  Pretty grim for someone with no real major party opposition (Democratic candidate pulled 11%).

Alaska is a pretty conservative state, so once on the republican ticket, with all the mechanics of Washington supporting, it is very hard to unseat an incumbent.    

I would look at it this way:  In what other races did the third party candidate get 30% of the vote?  In the house, Young pulled 50% and the Democratic candidate pulled 36%, Libertarian 10%.