leap, makeover, social reformer, meliorist, development, crusader, improvement, boost, reformist, step change, a change for the better/worse, turnaround, upswing, self-improvement.
He does not have to become a reformer,
but he recognizes social wrongs resulting from custom or stupidity or downright wickedness.
We take it for granted, and find it hard to understand what the reformer
was so excited about.
He's very much interested in this campaign, being something of a reformer