From “Dark Knight” to “Dark Tower?” Fresh off his Golden Globe win for the “The Fighter,” sources say Christian Bale has pulled ahead of Javier Bardem and Viggo Mortensen as Ron Howard and Stephen King‘s choice for “Tower” main character, gunslinger Roland Deschain. We previously reported that Howard’s adaptation of King’s books has set off a casting frenzy, with agents battling to land their clients roles in what promises to be a blockbuster franchise. A source said “Dexter” star Jennifer Carpenter is rising on the short list for the role of Susannah, as is French/Moroccan Ghita Tazi.