That's it. Basically he was supposed to be the traditional Republican on the ticked (i.e. the Bush wing GOPe guy). He had, at best, mixed results at all of those objectives. And the guy who's only purpose was to be the quiet dork in the back of the room is hardly a good reason to make him President. So what did he do in that role that set him up for it? Nothing, until the very end when he folded like a cheap suit and played a big role in election fraud.
No thanks to this Bush-wing GOPe jerk.
In other words, he'll be a good loser.
The same reason every President this Century has been picked and most of the last Century was chosen: "The alternative would be worse..."