He won’t be alone. There is preliminary talk of Cruz assembling a high-profile team of GOP surrogates and bringing them to Indiana, according to sources familiar with the Cruz campaign’s internal deliberations. The goal would be to project unprecedented party unity against Trump with a roster of supporters that, in addition to familiar faces such as Walker and Carly Fiorina, could include Jeb Bush or even Mitt Romney. Is that what last night’s surprisingly upbeat Cruz speech was about? Sounding more like a traditional general-election candidate in order to encourage establishment Republicans to unite with him now? In any case,...