The comment was beyond stupid for a white person in politics and a republican at that. We all know that democrats and especially minority candidates get a pass for stupid statements (which is wrong but that's life) but for Allen to lose his seat over this would rank right up there with the all time boneheaded decisions of all time.
BS ~ calling somebody "Mr. Mohawk" has nothing whatsoever to do with "white person" ~ but it does have a lot to do with the ability and willingness of leftwingnuts to redefine words to suit themselves ~ and, to take feigned offense suitible for use by their running dog lackeys in the press.
There are numerous places on the internet where you and others can bother to learn Mingo, or non-confederation Iriquois ~ it will also enhance your understanding of "The Simpsons".