Nikki Haley has said that Donald Trump has become significantly "diminished" in his mental capacity, is "not qualified" to be president, and is in fact "unhinged." She's accused him of cozying up to Russian President Vladimir Putin, has said his positions on NATO are "bone-chilling," and (following comments Trump made about Haley's deployed husband) that he is "disgusting."

Trump, for his part, has said that Haley has "gone crazy," has mocked her race and heritage by making fun of her birth name, and has implied, as he did with former President Barack Obama, that she might not really be American.

And she will be his vice presidential candidate.

Here's why.

First, despite all of Trump's vindictiveness, he's an opportunist, and one who has a history of making alliances that benefit him, even with people he's railed against as if they were his worst enemy. You might even say that for someone who has many, many, many bad qualities, it might actually be a good one: the ability to put hard feelings behind him in order to move forward. That forward movement is always for himself first and everyone else second, and he'll just as quickly abandon that person when he no longer needs them, but still ... he does do it.

When he felt the best person to lead the Trump Tower construction was Barbara Res, Trump put aside his blatant sexism and hired her. In his business career he had vicious........

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