[PapaBear3625]

I’m somewhat surprised he knows who Rutherford B. Hayes is.

He probably didn't. He just had a speechwriter who did.

[Lonesome in Massachussets]

I was more surprized to learn that John Tyler, who was born in 1790 has a grandson who is still alive. http://nymag.com/daily/intel/2012/01/president-tyler-grandson-alive.html

That would be like me having a grandson who lived into the 2170’s.