Mass Live – Attorney General Martha Coakley on Thursday came out against a bill allowing online gambling because it would open the door to the use of credit cards to buy Lottery products. The bill was sponsored by Treasurer Steve Grossman. Coakley’s comments opened up a new issue in the 2014 gubernatorial race, in which Coakley and Grossman are the two leading Democratic candidates. Grossman had recently attacked Coakley for her positions on criminal justice issues. Coakley’s statements indicate that she plans to be equally aggressive against Grossman, focusing on his work as treasurer. Coakley did not mention Grossman in…