A little over a week after President Barack Obama spoke up, gay marriage supporters are cheering a second high-profile endorsement from the NAACP.

At the NAACP's quarterly board meeting in Miami, the 64-member board approved a resolution which calls gay marriage a “civil right and a matter of law.”

(Related: Julian Bond says Obama nudged NAACP on gay marriage.)

The Human Rights Campaign (HRC), the nation's largest gay rights advocate, called the move “historic.”

“We could not be more pleased with the NAACP's history-making vote today – which is yet another example of the traction marriage equality continues to gain in every community,” HRC President Joe Solmonese said in a statement.

GLAAD President Herndon Graddick called the NAACP “a leading advocate and a voice for members of marginalized communities.”

“Today's announcement represents their continued stance against the discrimination that LGBT families face,” he said.

Evan Wolfson, founder and president of Freedom to Marry, added: “The NAACP has long been the nation's conscience and champion for an America where all share equally in the promise of liberty and justice for all. Today the NAACP resoundingly affirmed that the freedom to marry is a civil right and family value that belongs to all of us, and that discriminatory barriers to marriage must fall.”

Wolfson also referred to gay marriage foe the National Organization for Marriage's (NOM) much-criticized strategy to pit minority groups against marriage equality supporters.

“The toxic tactics of anti-gay groups like NOM to 'drive a wedge between blacks and gays' will be washed away in the wave of righteous affirmation,” he said.

Stuart Gaffney, media director for Marriage Equality USA, concluded that “Standing together from coast-to-coast with allies such as the NAACP is what is going to make the dream of marriage equality for all loving couples a reality.”

(Related: Keith Ratliff: NAACP board's most outspoken gay marriage foe.)