Newt was my favorite of the 2012 primary candidates to watch. I sure hope he runs to see what other crazy plans he has in store for America.
Newt ruined any chance he had of being a competitive candidate in 2016 because he stayed in the GOP primary well past time. If he had dropped out after Super Tuesday and saved face (backed Romney or even Santorum within a reasonable time frame) he would have remained with a semi positive image among GOP voters and still considered a "smart, ideas guy", rather than an old buzzard who doesn't know when to quit.
But alas, its over for him, reputation is done.. otoh I still have GOP friends today who say that if Newt had been the nominee he would have won by creaming Obama in the debates.