Interestingly, Richardson might have had a “natural born citizen” issue, too, had he succeeded in his quest for the presidency:
Bill Richardson was born in Pasadena, California.[5][6] His father, William Blaine Richardson Jr. (died in 1972), was an American Citibank executive[5][6] who grew up in Boston, Massachusetts[5] and lived and worked in Mexico City.[6] His mother, María Luisa López-Collada Márquez[6] is the Mexican daughter of a Spanish father from Villaviciosa, Asturias, Spain and a Mexican mother[7][5][8][9] and was his father’s secretary[6].[8] Richardson’s father was born in Nicaragua.[6] Just before Richardson was born, his father sent his mother to California to give birth because, as Richardson explained, “My father had a complex about not having been born in the United States.”[6] Richardson, a U.S. citizen by birthright, was raised during his childhood in Mexico City.[6][8] At age 13, Richardson’s parents sent him to Massachusetts to attend a preparatory school, Middlesex School in Concord, Massachusetts, where he played baseball as a pitcher.[6]
http://en.wikipedia.org/wiki/Bill_Richardson