Here is the link to Gov. Jennifer Granholm’s biography
http://immigration.about.com/b/2009/01/14/immigrant-spotlight-gov-jennifer-granholm.htm
Granholm’s family moved to the U.S. when she was four years old. She grew up in California and became a naturalized U.S. citizen at the age of 21.
Here is the transcript of Granholm’s statements admitting to dual Citizenship to Chris Wallace. Scroll down half the page.
That biography says nothing about one of her parents being American. Ted Cruz was born to an American mother, making him an American.