A second poll has found that a majority of Virginians approve of gay marriage.

According to a survey released Thursday by the Human Rights Campaign (HRC) and conducted by the Democratic polling firm Greenberg Quinlan Rosner and the Republican firm Target Point Consulting, 55 percent of Virginians support gay nuptials, while 41 percent remain opposed.

A previous The Washington Post poll conducted in May also found majority (56%) support for marriage equality.

In Thursday's poll, support was highest (68%) in Northern Virginia, which borders the District of Columbia, a 2009 entry in the marriage equality column. Sixty-three percent of Western Virginians oppose the state recognizing gay couples with marriage.

In 2006, voters overwhelmingly (57-43%) approved a constitutional amendment which prohibits the state from recognizing any union other than a heterosexual marriage.

The poll comes a day after the ACLU and Lambda Legal announced plans to file a lawsuit challenging the constitutionality of the amendment.

(Related: Gay marriage advocates file suits in Pennsylvania, Virginia, North Carolina.)

Nearly three out of four respondents said that they favor laws outlawing workplace discrimination based on sexual orientation at the state or federal level. Currently, Virginia does not have such a law.