Andrés Manuel López Obrador's win greeted with cautious optimism
Catholic bishops oppose proposed constitutional amendment
Activists staged counter-protests throughout the country
Enrique Peña Nieto seeks to amend country’s constitution
Decision establishes legal precedent for future cases
31 gay couples in Chihuahua sought legal recourse
Supreme Court rulings to have ‘positive effects’
Mexicali officials blocked men's previous attempts to marry
Counselor in city of Mexicali complained men ‘suffer from madness’
Man sought social security for same-sex spouse
