Parnell ran for a full term as governor in 2010. In the primary, he faced off against Bill Walker, a former mayor of Valdez, Alaska and aide to former governor Walter J. Hickel, and Ralph Samuels, a retiring member of the Alaska House of Representatives. Although Walker seemed to gain traction towards the end based on the issue of building a natural gas pipeline, Samuels and Walker split the anti-Parnell vote and Parnell won the nomination. He and Mead Treadwell, who had won the August primary for lieutenant governor, faced off against the Democratic ticket of former House majority leader and 2008 congressional nominee Ethan Berkowitz and Diane Benson. Parnell-Treadwell eventually defeated Berkowitz-Benson by over ten points.