Former governor of Michigan. Among other things, an amnesty supporter and a GOP "concern troll". Titles from some of her June 2012 shows (current.com/shows/the-war-room/topic/immigration): "Homeless and undocumented: A story of hope", "More rights, less raids: Deportation reprieve not same as citizenship", "Extra: How Republicans can earn Latino votes", etc.
This post has a list of the speakers at the Democratic National Convention and links to more information on their immigration positions when known. There are also a preview of how the immigration issue will be presented at the convention, and some things you can do if you oppose illegal immigration.