The right-wing Daily Caller reports:
In a statement provided to TheDC, both the former vice president and his wife, Lynne, said they are “delighted” the couple could have their “relationship recognized.” “Our daughter Mary and her long time partner, Heather Poe, were married today in Washington, DC,” the Cheneys said. Poe and Mary Cheney have two children: Cheney gave birth to a son in 2007, and a daughter in 2009. They live together in Virginia. “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. “Mary and Heather and their children are very important and much loved members of our family and we wish them every happiness.”
Commenters on the linked site are conflicted about this.