It would be a mistake to confuse The Fighter with the story of Mark Wahlberg, though the similarities are striking. Completely convincing as a boxer, Wahlberg plays welterweight Micky Ward, who grew up in working-class Massachusetts. Like the actor-producer, he had eight siblings, one more famous than the rest. Ward’s half-brother, Dicky Eklund (a gaunt, crazy-eyed Christian Bale), turned to boxing first,