Alaska Department of Natural Resources Commissioner Dan Sullivan resigned from his job Thursday in what appears to be a precursor to a Senate campaign.

Alaska Gov. Sean Parnell (R) announced Sullivan's departure in a statement. Sullivan has also served as attorney general of Alaska.

"Dan has been an instrumental part of my administration and his leadership will be missed," Parnell said. "I wish him much success in the future.”

A person with knowledge of Sullivan's plans told Post Politics that Sullivan will indeed run for Senate.

Sullivan said in his resignation letter that he intends "to seek ways to continue to serve my fellow Alaskans."

Sullivan is considered a leading potential GOP candidate to face Sen. Mark Begich (D-Alaska) in 2014. So far, the primary includes Parnell's lieutenant governor, Mead Treadwell, and 2010 GOP nominee Joe Miller. Treadwell officially launched his campaign on Thursday.

Sullivan is not to be confused with the Anchorage mayor of the same name, who has opted not to run for Senate next year.

The outgoing commissioner also served as an assistant secretary of state under George W. Bush and is a lieutenant colonel in the Marine Corps Reserve. He was recently deployed to Afghanistan.

Updated at 5:33 p.m.