Here is a video clip for you. They definitely don't sound like posers, and if they are they appear to have people in the area around the polling center fooled. Also the fact is that multiple news outlets are reporting the story and even Snopes has jumped in to attempt to help out Abrams, but the stories on this incident have already gone viral. Media Matters also reported on this incident stating that they are members of the New Black Panther Party.
Try to remember that Abrams may become the first Black Female Governor or Georgia. So why would the Black Panthers not march for a Black Woman? Your response that they are not real is weak at best, and I find it hard to believe that you didn't look up this story as well.
Also Georgia Politics are saying they are real. https://politics.myajc.com/blog/politics/those-pictures-new-black-panthers-campaigning-for-abrams-are-real-and-they-aren-apologizing/dWkTre7rm7cPy7cqd8xNxN/
"Georgia law allows people to carry around long guns, like rifles or shotguns. No permit is needed."
https://youtu.be/1g7LhlLSOzQ
So...how do you plan on going about proving that they are not real? Does CBS, Media Matters, and news outlets in Georgia have it wrong? Did CNN stage this incident and it's fake? I can't wait to hear your response.