MILWAUKEE — In some ways, it’s hard to see why Joe Biden would drop out. There’s no party establishment that can drive him out. He has expressed no openness to persuasion. There’s a plausible case that he is at least as electable as Vice President Kamala Harris or any other Democrat. And there’s no reason to believe he’s bothered by his own inability to actually be president of the United States

On the other hand, the dam of protection around Biden shows signs of cracking.

Biden’s disastrous debate performance showed the decline that Democrats and the news media had tried to hide, and every other day since then, more and more Democrats urge Biden to drop out of the race. And every day, the news looks more damning for Biden.

Now we have news that Biden has COVID — mostly harmless for most people but really dangerous for very old and frail people like Biden.

This could be the tipping point to drive Biden out of the race, especially because he said he would drop out if diagnosed with a medical condition. It could also kill him. In either event, Democrats are deeply in disarray.

Here at the Republican National Convention, the party’s speakers have spent two days attacking Biden. They all have scripts for tonight and Friday night attacking Biden.

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Are all those attacks, and all this prime-time free programming, wasted if Biden’s not the nominee? Delegates and guests in Milwaukee reacted to the Biden-COVID news with disbelief and confusion.

It’s obviously worse to be a Democrat today than a Republican, but the chaos factor here creates problems for the GOP too.