Mary Cheney, the openly gay daughter of former vice president Dick Cheney, married longtime partner Heather Poe on Friday in Washington, D.C.

The former vice president and his wife, Lynne, issued a statement Friday morning saying they are "delighted" about the marriage.

“Mary and Heather have been in a committed relationship for many years, and we are delighted that they were able to take advantage of the opportunity to have that relationship recognized,” the Cheneys said in a statement obtained by ABC News. “Mary and Heather and their children are very important and much-loved members of our family and we wish them every happiness.”

The couple are parents to a son and daughter.

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Mary Cheney memorably became a flashpoint in the 2004 presidential campaign, when both John Edwards and John KerryJohn Forbes KerryDem Sen. Markey faces potential primary challenge in Massachusetts Judd Gregg: The dangers of the Bolton Doctrine Rubio asks Barr to investigate Kerry over Iran meetings MORE mentioned her during debate questions on homosexuality. That drew ire from Cheney, who accused Kerry of exploiting his family to win the election.

"You saw a man who will say and do anything in order to get elected. And I am not just speaking as a father here, though I am a pretty angry father," Cheney said.

The former vice president was among the first prominent Republicans to signal support for same-sex marriage, doing so in 2009.

President Obama became the first sitting president to signal his support for gay marriage, doing so earlier this year. Republican presidential candidate Mitt Romney has said he believes marriage should remain between heterosexual couples.