I'm certainly not one of those committed to "Palin bashing."
When Letterman made his on-air comments about then 14-year-old Willow getting "knocked up" by a baseball player, I was offended by his attempt at sex comedy, employing a child. Check the SYG thread history, I was condemning Letterman, as harshly, or more harshly, than anyone. I still refuse to watch his show, but not just because of that incident. He stinks, big time as an "entertainer," IMO.
As far a Griffin, some like her, but most of what I've seen of her stimulates my gag reflex. In my opinion, she strives for vulgar, outrageous, shock jock, "comedy" and seems to be able find an audience by playing that.