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The president is too stupid to get out of his own way once again. Reports indicate that Mitch McConnell advised him against Kavanaugh for reasons of "baggage," so certainly people inside the GOP knew this was coming. And now he appears ready to stubbornly insist on sticking with him even though every day nearer to the election reduces the likelihood of this vote happening.
It would be easier to withdraw Kavanaugh and replace him with an equally awful human being and end up with the same outcomes ten years from now. If he sticks with him it only helps the Democrats – though it's worth pointing out that Schumer has not even put up a pretense of trying to delay this vote yet, so it's no sure thing he will ever start. It seems like there are some Republicans who are looking for a way out of voting for this guy. Starting over with another new nominee allows another week or two to run off the clock. If this goes into October, the odds that anyone 1) wants to be in DC and 2) wants to cast this vote 4 weeks before the election are both very slim.
A lot of this involves straw-grasping and speculation, but it's the first scenario I can see that plausibly (although not probably) ends with Kavanaugh not being confirmed. In the end, cynicism born of experience leads me to believe everyone calling for hearings is going to end up voting for him anyway. If there is any positive outcome to be found here, it will depend on Trump being too dumb to back down until it's too late.