As former U.S. President Jimmy Carter's funeral got underway, former presidents and first ladies were seen greeting each other before heading to their seats — but some pointedly avoided the Trumps

Trump is obviously no fan of Biden, but Obama and his veep also have a famously complex relationship, only made more so after Obama helped nudge Biden to quit the presidential race last summer. Surely Obama feels some frustration that Biden fumbled a possibly winnable race; maybe he couldn’t help spill to his sworn enemy?