Up Hillary's Sleeve?

Hillary Clinton has just released that she will not vote to confirm Roberts for the Supreme Court's Chief Justice slot.
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"because I think he is far more likely to vote the views he expressed in his legal writings, I cannot give my consent to his confirmation and will, therefore, vote against his confirmation. My desire to maintain the already fragile Supreme Court majority for civil rights, voting rights and women's rights outweigh the respect I have for Judge Roberts's intellect, character, and legal skills."DRUDGE REPORT FLASH THURS SEPT 22 18:54:35

I can only surmise that there is some kind of focus group research that she has to tell her that she can still be somewhat moderate/conservative for her likely bid for the White House in spite of voting against Roberts. Like her husband before her, Hillary doesn't make a move this serious without testing the waters or putting her finger up to see how the wind is blowing.

So here is the question: how is she going to live it down or downplay it as a part of her record? Is she gambling that he will do something as a sitting judge that will make her comment sound prophetic? Perhaps she would lose too much in her base if she did vote for him but knows he will get in regardless of how she votes?

Sometimes it can be very complicated with a Clinton. Maybe that last one is the answer.