The American political climate may feel polarized beyond belief, but there's been one consistent ray of hope shining through the mess: $4.
If you haven't seen them, the vice president's friendship with US President Barack Obama has been the source of many lighthearted internet posts in the days since the contentious 2016 presidential election.
So if all the partisan fighting has got you down, take some time to look back at Biden and Obama's predecessors in the realm of political best buddies.
$4 created this list of the best books about surprising, strange, and often heartwarming political friendships.
Here are his picks, listed in no particular order, with descriptions in his own words: