Nope. I don't think she could pull it off; furthermore…
Palin supports McCain. Palin will always support McCain, because McCain introduced American voters to her.
Someone who will always support McCain is not to be trusted. Period.
(It would show someone incapable of making a principled stance against someone who is a proven slimeball* and quite arguably a Traitor**).
* e.g. McCain-Feingold.
** e.g. Support/endorsement of the Muslim Brotherhood, which even Egyptians recognized as throwing in with terrorists.
Look I have problems with McCain.
Big problems in fact.
But McCain selected Sarah Palin as his Vice Presidential candidate in 2008.
Palin is a loyal person. Regardless of how badly it irritates a great deal of us, she is a loyal person. Period.
She is going to support McCain.
In spite of that, she’ll be a fabulous next President.