She didn't "widly" support him. She endorsed him, made two small appearances with him and then stayed away from him and did not campaign for him. Jan Brewer did more campaigning for him then Sarah did. Sarah repaid a debt, something honorable people do.
No matter how you color or spin it, it is hypocritical to criticize Brown and simultaneously support McCain, when McCain is more liberal of the two and has harmed our nation much more.