Board Thread:DC's Legends of Tomorrow discussions/@comment-27700324-20180403041223/@comment-2112031-20180409001053

Xandermcc wrote: What i wonder though is how did he become president? After all, there was already one president in the Arrowverse at the point Barack was in power. Well, Obama was mentioned in the very first episode of Arrow, when Oliver was mentioning the things that had happened during the five years he was missing ("There's a black president, that's new").

Also, I've heard a picture of Obama was visible in Waller's office at one point.

The simplest explanation is that Obama may have been a one term president in the Arrowverse, having lost the 2012 election to the president we saw during the Invasion! crossover.