Alaska Gov. Sean Parnell conceded to independent challenger Bill Walker Saturday night, over a week after the election. The Republican governor said he “deemed it in Alaskans' best interest” to concede the very tight race in a post on his Facebook page. “While a win for the Parnell-Sullivan ticket was numerically possible, it was highly improbable,” he said. Parnell served as Sarah Palin's running mater in 2006 and took office as governor after she resigned in 2009. Palin publicly endorsed Walker in this year's race.