MIAMI — The ads, texts and emails have become ubiquitous, how voting for a specific candidate could swing the U.S. Senate, Congress or even state houses. At the moment, it seemingly is all about swing votes. A case could be made that the same could be at hand for the Miami Heat, with training camp just over a week away. The known quantities are Jimmy Butler, Bam Adebayo, Tyler Herro. But a case could be made that the Heat’s swing vote is Terry Rozier, who arrived at midseason last January, was hurt, played well, put on a tour de force as closer in a road victory over the Cleveland Cavaliers, and then was hurt again. For the Heat the stakes are high, and for more than the potentially unprotected pick sent out to the Charlotte Hornets along with Kyle Lowry for Rozier. As Heat General Manager Andy Elisburg stressed during summer league, the Heat preempted a potential move this offseason in favor of the salary space ceded in January to Rozier. Based on what was spent, where the money otherwise did not go, and how it played out in Rozier’s absence in the postseason, the notion of Rozier as swing vote can’t help but stand among the most significant of storylines during camp, the regular season and beyond. The Heat need to make it work, because of the roster limitations otherwise created. Coach Erik Spoelstra needs to make it work, because an injection of offense is sorely needed. Rozier needs to make it work, if only because for years he said this has stood as a target destination. Of the latter emphasis, Rozier enters his first Heat camp aware of the stakes, expectations and needs — even as he stressed having ignored that chatter during a trying offseason that had him rehabilitating from his season-ending neck injury. “For sure, for sure,” he said.