You realize you're citing a 10 year old poll of less than 800 Native Americans by a group that makes no bones about it's conservative agenda as your main "missile". You're shooting blanks my friend.
So a poll conducted in 2004 is irrelevant? LOL And the Annenberg Public Policy Center is out of U Penn...a stalwart of conservative thought /sarcasm
Check the survey methods in the actual study, they took a random sample of Native Americans across the 48 continental states, and given the total population of Native Americans in the said states, 800 particpants was enough to be statistically significant to +/- 2 percentage points.
And it still doesn't discount the fact that there are several predominately Native American highschools that have NO issue with the mascot, and in fact are in favor of it. They just don't' know whats good for them eh?