I thought he was a Republican turned independent, but yup, this guy is in office thanks largely to Palin's endorsement. Without it the Republican, Parnell, would almost certainly have won. Palin thought Parnell was too beholden to "big oil".
Walker was republican in the primary until his chances improved by joining the democrat running for governor. He changed his affiliation to the “Unity” ticket supported by the unions and natives. The head of the AFL CIO made sure that he got the vote of the socialists in exchange for his loyalty. The democrat is his Lt Gov and the AFL CIO call the shots. Yes, Sarah endorsed him over Parnell, her ex Lt Gov.