These are examples of counterfactuals. You can't know for certain what would have happened if they were president, because they weren't
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We can know for certain that Al Gore wouldn’t have invaded Iraq because he didn’t have a personal grudge from Al Gore Sr. invading Iraq the previous decade. We know for certain that Hillary Clinton wouldn’t have appointed anti-abortion judges to the Supreme Court because she’s pro-choice.
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Iraq wasn't personal. It was part of the clean break strategy which was being lobbied for by Israel.

I doubt HRC would have appointed anti-abortion justices. But I could very much see a situation like the one we got where a seat was left unfilled or a geriatric Democratic Justice refuses to resign
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