Democrat Ethan Berkowitz is now officially running for governor of Alaska in 2010 — a race in which he hopes to expand upon the statewide base he built with his competitive 2008 challenge to veteran Republican Rep. Don Young, the state’s only U.S. House member.

Berkowitz, who faces primary competition, is seeking to challenge interim Republican Gov. Sean Parnell. Parnell moved up from lieutenant governor on July 26 after incumbent Sarah Palin — the 2008 Republican vice presidential nominee — resigned the office.

A Parnell-Berkowitz matchup would be a rematch of sorts, as both were lieutenant governor nominees, but they ran on gubernatorial tickets, Parnell with Palin and Berkowitz with Tony Knowles, a former governor who unsuccessfully sought a comeback in that race.