The late shows have always had their monologue. Unfortunately - low hanging fruit - Obama has had his issues, but I don't know how ripe they were for satire.
I used to watch Jay Leno for his Democrat jokes and Letterman for his republican Jabs -
No I am generally asleep long before the late shows....
as long as the monologues play well with ratings groups they will continue.
what is the demographic target for these late night shows?