Well the left leaning bias is on full display here. I have no doubt if a major Republican politician claimed to be part Native American and didn’t look anything like a Native American, people in here would be saying take a DNA test or fess up.
I don’t know if people in here would be saying that but I’m pretty sure there would be plenty of mocking.
On the topic of bias and arguments, this article on “progressive hostility” looks compelling. I’ve only read a little of it but I’ve heard similar complaints from people I know.