I don't know what he has specifically said (or hasn't said) but I did catch that endorsement on Facebook. I don't know her at all but it caught my eye because we have reservations in Wisconsin (my home state).
From Facebook last week:
Natives for Bernie Sanders shared Tara Zhaabowekwe Houska's post.
February 25 at 7:11pm ·
Winona LaDuke is now #FeelingTheBern and has endorsed him!!
Tara Zhaabowekwe Houska to Natives for Bernie Sanders
February 25 at 6:58pm · Washington ·
My niijii and boss, Winona:
My reservation (White Earth Reservation) in northern Minnesota is fighting a number of proposed pipelines, including one that will accomplish what the Keystone XL pipeline failed to: transporting some of the dirtiest fossil fuel in the world from Alberta, Canada, into the United States. These pipelines would carry both Canadian tar sands and fracked gas from South Dakota. We need politicians who will stand with us and all the other Indian territories that oppose these pipelines being built on our lands. Most of the oil and gas extracted is from lands within Native territories. The best answer for future generations is to keep fossil fuels in the ground. Bernie understands that.
LaDuke is the co-founder and Executive Director of both the White Earth Land Recovery Project and Honor the Earth, a national advocacy group which raises awareness and financial support for Native environmental issues. She graduated from Harvard with a degree in Rural Economic Development in 1982, and in 1989 earned a Master's Degree in Community Economic Development from Antioch University. She is a 1988 winner of the Reebok Human Rights Award, was named Woman of the Year by Ms. Magazine in 1997 and is a two-time Vice Presidential candidate on the Green Party ticket.
Im standing with Bernie Sanders because he understands there are issues of race and corporate privilege in our society. We must have the courage to stand up to big corporations. The candidate with that courage is Bernie Sanders.
#FeelTheBern