Doubtful.... a Native American Democrat politician recently jumped ship to the Republicans because Democrats have thrown their values out of the window.
http://www.dailywire.com/news/1374/democrat-native-american-senator-shocks-becoming-chase-stephens
One of my best friends, who has some (genuine) Seneca Indian heritage can't be arsed with voitng any more but still posts stuff on Facebook that's generally pro-Trump flavour... her family are Christian types from Upper New York State, and heavily involved in American Legion activities..... but my friend herself is a Bi-sexual pro-BDSM Satanist Goth.
One of my other best friends, who has some Cherokee mixed in with her Scottish-American ancestry, recently switched to Buddism.... and her family REALLY hate Hillary.
There's also a chance Native Americans getting behind Trump if Hillary picks Elizabeth "Fauxcahontas" Warren as a running mate, as her ancestors were involved in rounding up Cherokee Indians during the "Trail of Tears".
http://www.breitbart.com/big-government/2012/05/08/elizabeth-warren-ancestor-trail-of-tears/