Massachusetts Governor Deval Patrick on Twitter:

Freedom includes keeping gov't out of people’s personal & intimate choices, & affirming human dignity. Today's decisions do that. #LoveisLove

Statement from Attorney General Martha Coakley:

“This ruling is a victory for equality and civil rights for all.  By striking down DOMA, the highest court has ensured that married same-sex couples are treated equally under federal law. Thousands of families throughout Massachusetts and the nation will no longer be denied social security, medical benefits or other fundamental protections simply because of who they love."

Massachusetts Treasurer Steve Grossman on Twitter:

Today's #SCOTUS decision on DOMA reaffirms what the people of MA have always believed: everyone deserves "Equal justice under law."

Statement from Rhode Island Governor Lincoln Chaffee:

"For the nearly two decades that DOMA was the law of the land in our country, discrimination and unequal treatment were, regrettably, given legal legitimacy. Today’s decision, therefore, is a meaningful, positive development in the long and ongoing story of the United States as the freest country on earth."

Statement from Boston Mayor Thomas Menino:

Today is a great day for all of our people. Marriage equality first played out right here in Boston and like the many firsts Boston has championed it has proven to be the right path forward for a more open, inclusive America, where everyone is welcome to love, pray and believe however they choose. I am grateful for the Supreme Court’s decision to strike down the Defense Against Marriage Act. It gives our many employees and residents the rights of other married couples and more importantly recognizes that their love is no different.
 

From the AP:

U.S. Sen.-elect Edward Markey also praised Wednesday's ruling, saying the court stood with "the millions of voices across the nation calling for marriage equality.

Massachusetts Rep. Stephen Lynch:

In holding #DOMA to be unconstitutional, today’s landmark decision in U.S. v. Windsor reflects the best ideals of our nation.

President Barack Obama on Twitter:

Today's DOMA ruling is a historic step forward for #MarriageEquality. #LoveIsLove

Read the Supreme Court's ruling here.