May 22, 2015: Ireland votes to legalize same-sex marriage
May 18, 2004: Ohio activist launches amendment campaign
May 17, 2004: First same-sex couples marry in Massachusetts
May 16, 1994: Anti-gay activists meet in Colorado Springs
May 15, 2008: California Supreme Court strikes down marriage ban
May 15, 2002: Federal Marriage Amendment introduced in House
May 11, 2011: Minnesota legislators send super-DOMA amendment to ballot
May 9, 2012: Barack Obama announces marriage reversal
May 7, 1996: Defense of Marriage Act introduced in House
May 5, 1993: Hawaii Supreme Court rules for gay marriage
May 4, 2012: Biden announces support for gay marriage
April 30, 2001: Evan Wolfson leaves Lambda to focus on marriage
April 28, 2015: Supreme Court hears marriage case
April 26, 2000: Vermont enacts civil-union law
April 20, 2005: Connecticut enacts civil-union law
April 19, 2009: Marriage debate dominates Miss USA pageant
April 11, 2001: Mary Bonauto files Massachusetts marriage suit
April 7, 2009: Vermont enacts marriage law
April 3, 2009: Iowa court asserts gays can marry
April 1, 2001: Netherlands legalizes same-sex marriage