These five being part of a nifty little speculation in alternate history over at io9. Each one of those represent the people who would have become President if (respectively) Tyler, Andrew Johnson, Wilson, FDR, and/or Nixon had died, gotten impeached, and/or resigned at a reasonably plausible moment. Of the bunch of them, I think that I like the possibilities of Thomas Riley Marshall best; in fact, he’ll be useful for something in the back of my head.
If you think that this is a weird discussion… well, it is. But imagine American history without Teddy Roosevelt or Chester A Arthur as Presidents – which could have very easily happened – and you might see the possibilities there.