Attorney General Douglas Gansler and Lt. Gov. Anthony Brown both put forth campaign pledge proposals last week in what has become a hotly contested Democratic primary in the Maryland race for governor. Gansler asked fellow Democrats to sign a pledge discouraging outside spending on the race. Brown then proposed abandoning all negative ads in the campaign. The candidates campaign’s have gone back and forth in recent days attacking the proposals. Del. Heather Mizeur, a third candidate in the race, has largely stayed out of the disputes. Public policy professor and chair Donald Norris was interviewed by The Washington Post for an article …