SNL parodied her much earlier than the Youtube skit linked above. I distinctly remember Gilda Radner saying "BaBa WaWa" in several parodies of Barbara Walters. Although it has been a gazillion years since I've seen those skits, so it's remotely possible that I could be slightly mistaken.
In early April of 1979 then-Pwesident Carter got weewy weewy big after going in to qwean up a spwill in the core of the 3 Mile Island nuclear weactor. She joined us as the pwess confwence was alweady in pwogwess.
I busted a gut when she said "Wet's wisten in"
It may be inappropriate in this "obituary" thread, but that's never stopped me before.