The tailgate was aimed at boosting a protégé, but it was Donald Trump whose name and image were plastered everywhere — on the banner hung from Republicans’ table outside the Arizona State University football game, on baseball caps, on signs they carried and stickers they fixed to tank-tops on a Friday night where the pavement was still hot and the temperature, at dusk, hovered around 95 degrees. They might have turned out to support the protégé, Kari Lake, but it was his movement...