A recent Baltimore Sun poll shows Maryland Lt. Gov. Anthony Brown has the support of 41 percent of likely Democratic voters in the gubernatorial primary. That number gives him a lead of 2 to 1 over Attorney General Doug Gansler (20 percent) and a 3 to 1 advantage over Del. Heather Mizeur (15 percent). In his latest column in The Baltimore Sun, Political Science Professor Thomas Schaller offers an explanation for why Brown is so far ahead in the race, but also why he has yet to put a lock on the job. “The first observation is that the key party players, including …