Because it works every 4 years to get out the lib base voter.
Damn sure it works. You’d be surprised (or maybe you wouldn’t) at the numbers of people who identify as black or non-white on internet forums who insist that they can’t be racist “because I have no power.” That’s like saying they can’t be evil in other matters because they have no power. It’s almost impossible to dissuade them from their lunatic beliefs. And they swallow anything the Dem Party ladles out.