GOP strategist Alex Castellanos on Sunday's This Week.



CASTELLANOS: Yeah. I have a slightly more optimistic view of Trump's chances. I think they're at least 50/50, if not better.



First of all, Donald Trump is a talented political salesman. Hillary Clinton is one of the worst candidates in human history. Hillary Clinton has never been up against a candidate like Donald Trump with, you know, 10 arms and eight legs.



This guy tweets at night, crosses freeways with Secret Service details...



STEPHANOPOULOS: But is that an advantage in a general election? I mean...



CASTELLANOS: He's going to keep her off balance all the way through this thing.



But more importantly, Hillary -- the country is in trouble. The plane is headed for the top of the mountain here. We're going to crash unless we pull back. And Hillary Clinton is more of the same. The country is in the mood for disruptive change...



BRAZILE: Alex, please get some more rest.



The truth is I think that if you look at the electoral map...



CASTELLANOS: There are 16 dead Republicans out there who underestimated Donald Trump. Beware.