hmm what did palin mean by free pass

In Palin's new book, she says Obama got a free pass. I am at a lost can you tell me what she means by this. According to the book, Palin thought Obama was a gifted speaker, but feared "his smooth style would obscure" the fact that he wasn't saying much. She says the true Obama, the one who associated with William Ayers and Jeremiah Wright, was "concealed in centrist campaign-speak," but has been revealed since taking office. Palin calls Obama extreme on abortion and argues that Obama got a "free pass" in the Democratic primary when compared to Hillary Clinton.

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