"He’ll almost certainly trudge on for a while, but it’s clear his heart is not in it anymore, if it ever was."
Not that I wish to pick on Digby, because everyone is saying the same thing. But does anyone think that, after years of preparation and work, Bush suddenly decided he didn't care about being President? Particularly when you consider that all it would have taken was a marginally passable performance; all the big money guys were ready to fall in line behind him, virtually guaranteeing him the Republican nomination.
No, the reason for his failure is not that he suddenly sat down on the side of the road like the hare in the fable, and let all the tortoises pass him by. The real answer, I suspect, is that this is who he really is- a stodgy, vapid man who felt his family's position entitled him to the Republican nomination; a man who wanted it plenty badly, but didn't really bother to prepare to get it, because he believed it was already his for the asking.
So, it's time to send another spurt of hatred in the direction of the stupid Florida voters who made him Governor, and thereby gave him a national platform. Not the stupidest they have ever been- after Bush they elected and then re-elected one of the worst corporate criminals in American history. But let us not forget that these miserable, ignorant Republican voters in Florida put Bush in a position to rig the election that saddled us with his brother as President- by far the worst President in our history. Jeb! is not just George W's brother; he was a key part of the criminal conspiracy that produced the Iraq war and the supply-side depression.
And still, don't forget that he is not gone. The money guys are just not going to trust Trump or Carson or Cruz, because they know those three are deeply delusional cranks. And I don't think they are going to believe that the little weasel Marco Rubio is up to the job of protecting their ownership of the country either. So, if Bush is sensible, and goes into a political rope-a-dope until the inevitable self-inflicted disintegration of these other candidates, he could emerge again this spring, as still the favorite of his fellow rich guys. Remember, that at this time in 2008, John McCain was virtually written off, yet he ended up with the nomination, because he was the only one the rich donors really trusted. The same thing happened with Mitt Romney, despite his obvious deficiencies as a candidate. They trust Jeb! too, so don't count him out. As long as he can shrug off the humiliation of getting abused by right wing cranks at the debates, he may very well be their candidate; at which time the Republican rank and file will, as usual, forget completely what a worthless jerk he is, and decide that he is just the thing to save the country from eight years of Democratic peace and economic growth.