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?

As they filed into the front pews at the National Cathedral, wearing dark suits and mostly solemn faces, five current and former presidents came together for Jimmy Carter's funeral. For a service that stretched more than an hour,