Mark Wahlberg plays a college professor with a near-suicidal addiction to gambling in his new film, "The Gambler." While he knew moviegoers would have little trouble buying into him as a guy with an obsession for blackjack, the "day job" side of his character would be trickier. The Boston native, famed for his "blue collar types" on the screen, is "no viewer's idea of a professorial type," Justin Chang complained in Variety.