Leaning no. Yes, he's "putting himself out there" so he can sell books. There is that. He has his book out now, and so he's doing this national media tour to promote it. But the book has been in the works for a long time. It doesn't really give us any great new insight into his interest in a national campaign that we didn't already have a few weeks ago.
I think Bush wants to keep his options open, but he's pragmatic, and will probably only run if he sees a clear path to victory. But I don't think he will see a clear path to victory, so he won't run. His wife doesn't like the spotlight, and will probably try to dissuade him from running, if nothing else. Since his decision to not run in 2012, he's already seemed to start burning his political bridges, saying that the GOP should consider agreeing to tax increases for a deficit deal, and making comments like this:
https://uselectionatlas.org/FORUM/index.php?topic=164982.msg3527600#msg3527600As that big New York Magazine profile notes, despite his recent immigration muddle, he's moved left since leaving office:
http://nymag.com/news/politics/elections-2012/jeb-bush-2012-10/My guess is actually that Bush doesn't run, but endorses Rubio, and hopes that Rubio wins the White House, so that he can wield influence through his relationship with Rubio. (Even though, as I said, Bush is now probably closer to someone like Jon Huntsman ideologically.)
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