Michael Bloomberg spent $12 million last year trying to get members of the Senate to vote for background checks, but his return on investment was lousy.  So this year Mr. Bloomberg has as a new strategy.  Instead of trying to change lawmaker’s minds, he’s going to try and change their faces.  Borrowing a page from the NRA playbook, his new group, Everytown For Gun Safey, will campaign against lawmakers who don’t support their agenda.