This year Alaskans have an opportunity to waste their vote. Incumbent Bill Walker (I) suspended his campaign but remains on the ballot, so filling that bubble would be throwing the vote.
As far as the electable candidates go, Democratic candidate Mark Begich was Mayor of Anchorage from 2003 to 2009, and then was a Senator for Alaska from 2009 to 2015. Endorsed by Bill Walker.
Republican Mike Dunleavy was State Senator, 2012 to 2018 and a Senate Finance Committee Member. Endorsed by President Trump.
Libertarian Candidate Billy Toien was Executive Committee, Alaska Libertarian Party; Delegate, 2008 Republican Convention.
A poll conducted by Ballotpedia on October 22, after Bill Walker suspended his campaign, shows that Dunleavy holds 48% while Begich holds 44% of a sample poll of 500 people.