She spouts this stuff because it plays to the radical Left of the party. She's trying to out "Left" Bernie to win the primary.
Boys and men self-identifying themselves as girls and women, in order to get an advantage on the sports field is just plain wrong. It is plainly unfair.
The cruelty is to the female athletes who are taken advantage of by the males to enable some politicians, like Warren, to use it as an issue.
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This will go on until some woman gets killed. You know it will.