Naturally, the economy was the main subject for both Bush III and Clinton II. Jeb promised to pull the economy upwards by creating 19 million new jobs, and make America an economic superpower. How exactly? He never ventured into detail. He just said he'd do it, period. After all, wasn't he the Florida governor between '99 and '07, when he introduced a relatively balanced budget, cut the state's debts and reformed the education system? Sounds like the guy's got some credentials. Or at least that's what his supporters say.
Jeb Bush may've shown that he can govern a state, which distinguishes him from a number of Republican candidates, like Marco Rubio and Rand Paul. Even from Hillary by the way, who was a senator from New York. None of Jeb's rivals have actually governed anything. Even this fact on its own could sway some voters in his favor.
Contrary to most expectations, Jeb didn't distance himself from the Bush clan. His mom Barbara was sitting beside him as he was delivering that speech. Shortly before that, he had a phone convo with his 91 y.o. dad. Many GOPers might've actually been repulsed if he had tried to distance himself from his own family. While tactics does play a significant role in the election race, family remains intact so far.
Jeb may not be the best orator, but he looks spontaneous, and creates the impression of someone trustworthy. And these things matter for a lot of folks. He does describe himself as "introvert", but that's hardly something anyone would call a flaw. Certainly not the Republican voters. The polls indicate that his speech, as clumsy as it may have been, has earned him a couple of points among the electorate - although in the meantime his visit to Europe went largely unnoticed by the US media.
Still, unlike some of his fellow partymen, he has refrained from making radical statements during his visit in Germany, Poland and the Baltics. That could also be a bonus for him in the long run. But of course it's too early to say if he'll be the GOP's nominee at this point. It's just that he looks the least crazy of them all for the time being. Which may not help him win the presidency, but it could certainly put him in one of the two contender seats.