It exposes his shortcomings. I say this makes Jeb! appear even weaker, if that's possible. He began this campaign omitting the Bush surname from his campaign signage to differentiate himself from what most Americans assess as a poisonous stigma of his idiotic brother's disastrous reign. Now trotting that very idiot (nucular, he says) out to the dais shows Jeb is resigned to the fact he can't get this done on his own merits. I doubt this obvious and sad desperation will change any minds in his favor.
It's becoming more of a comedy-fest as the days pass.
We have Oliver Hardy (reincarnated as Donald Trump, or is that Donald Duck?) being opposed by Abbott and Costello, embodied in the Bush brothers. Then, representing the other side, we have Snow White's old mum playing Mirror, mirror on the wall.
Walt Disney couldn't have written a better script.