New York Magazine national correspondent Gabriel Debenedetti provides an inside look at the complicated, co-dependent, and at-times rocky relationship between Joe Biden and Barack Obama, which has shaped Democratic politics over the past 16 years.

Delving deeper than the bromance narrative that's held the public eye, The Long Alliance examines the past, present, and future of this historic partnership — its twists and turns, ruptures and reunions, and the pivotal moment in each man's legacy at which we've arrived.

Obama needed Biden's experience to help him win in 2008, and he relied on him heavily during his first years as president. But their relationship soured over policy disagreements and Biden's blundering approach to Congress and voters. Then Obama's decision to support Hillary Clinton's nomination in 2015 created a rift that lasted for years. Now, in an ironic twist, President Biden is in the position to restore Obama's legacy — one that Donald Trump spent years trying to dismantle — and to implement a more radical, progressive agenda that the former president could only have dreamed of.

The real tale of this relationship is significantly more complex, dramatic, and consequential than is generally believed. The original mismatch between the know-it-all worshipper of legislative procedure and the hot-shot political Messiah moulded not just four different presidential campaigns and two different political parties, but also wars, a devastating near-depression, the lives of millions of immigrants, and movements for social equality. Now their relationship is shaping a second presidential administration, and the future of Democratic politics.