Cheney said she made the surprising discovery that her 66-year-old Republican husband and Obama, 46, are eighth cousins while she was doing family research for a book about her experiences growing up in Wyoming.
The vice president's wife said she traced a common ancestor of the two men to Mareen Duvall, a 17th century immigrant from France.
A month ago, the Chicago Sun-Times printed that Obama and Cheney were ninth cousins, once removed.
The Illinois senator and the vice president are diametrically opposed on many issues but particularly when it comes to the Iraq war, which Obama opposes but Cheney supports.
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