Trump will lose to Hillary in the general, so establishment Republicans are rallying Cruz in order to stay relevant.
Jeb's endorsement is encouraging as a sign that Cruz's campaign is approaching critical mass.
Like a political judoka, Ted has brilliantly used the media blackout in his favor.
European press has been trashing Trump for months and propping up Hillary, refusing to even mention Ted in most articles.
This has left Cruz untarnished in the eyes of the World, allowing him to emerge as a strong nominee.