I watched that also,and you are wrong, she looked confident,happy, and ready to kick butt.
She looked very serious, and really into slamming Obummer, and giving a warning to the Candidates in the debate to buck up. What do you want a clown face?
Perhaps I misread 'serious'. . .Sarah usually more exuberant (and a bit higher pitched). - though think she has been bringing it 'down' per Bachman example. Or perhaps, she is just finally taking Maggie Thatcher's advice...
As to what do you want, a clown face?. Will leave that as a question that begs no answer.. .