Bristol Palin is weighing in on Tina Fey's latest impersonation of her mom on "Saturday Night Live." Writing on her blog, Bristol said: "Saturday Night Live and Fey have been clinging to this impersonation a little too long. It's getting pathetic." Bristol added: "I may be biased, but I think my mom trumps her in the looks department. (Especially for having three more kids and seven more years on Tina!)"