Well its a unique state located well off from the mainland. The political dynamics there are surely going to be different than say Montana. That being said Dan Sullivan seems like a pretty generic R and he hasn't faced any significant issues yet.
Ye, I was going to say it's not rlly that AK Dems are particularly strong but that politics in AK is so unique and so local you see a lot of crossover voting downballot on the state level. Furthermore, AK Dems have a pretty effective vote distribution since AK Rs sort of pack into the Mat-Su/Wasilla area.