It was about the fact that Alexandria Ocasio-Cortez is the left's Sarah Palin. 
Phoenix Dark, who is the best political poster here and on RE, agrees with me on this, btw. 
AOC is a feel good story, but she clearly has work to do.  I mean, she's a kid politically both in tenure and in the career path.
It also shows how much of a heavyweight Hillary was, although she was not likable, Hildawg could take this heat.  Again, different paths, though.  Hillary was a seasoned observer Washington by the time she ran a second time.  First Lady, Senator, SoS, and two presidential campaigns.