Partisanship refers to political decisions made to favor the policy maker´s party-preferred ideological orientation. When it comes to judicial decisions, a judge becomes a partisan when his rulings are meant to promote the interests of the political party he favors.
Despite the legal model holding to the idea that judicial impartiality forbids any partisan loyalties, partisanship still exists.
He just wanted to start over is my guess.. I mean he learned from that mistake. That is what life is about, learn from your mistakes and do better in life.