watching Frontline on pbs

I noticed ads on CBS last night that Walz was going to be on with Colbert. Did they not learn anything from having Harris on Saturday Night Live? Of course now they won't have time to give Trump equal time before the election.

Isn't Colbert one of those late night TV hosts?  If so, does anyone watch them anymore?  After Johny Carson they just haven't been the same. Jay Leno was ok, but the rest were insufferable wannabees.