Nathan's running for Congress, which is a 2-year term. Presuming us to 'now' (in the continuity) be two years before a presidential-election year, I can easily see how the Strong Compassionate Leader Of The NYC Rebirth could be, with a little bit of behind-the-scenes calling-in of favors, get as much buzz behind him as Obama's gotten in his first term in our actual world, and then you get over the 'no experience, young' problem by making him vice.

And then he's a heartbeat away.

The 'future' we're to be shown next week is 5 years after 'now' -- meaning 2 years as Congresscritter and then up to 3 years in the White House, either as second-fiddle or top banana.