Donald Trump didn't have a polling operation until very late in his campaign. How did he know what to do? That the Ted Cruz people leaked their polls to Trump because they were looking forward to eliminating all the other rivals, clearing the way for a Cruz-Trump fight that they were certain Cruz would win. In the end, Cruz was the last man standing, it's true. If he had known at the beginning what he knew at the end, he might have thought twice. The Congressional Republican Party thought they could make Trump their tool to impose their very unpopular agenda. Instead, they became his tool.
Democracy requires you to learn how to lose as well as how to exercise power when you win. And that requires restraint all around. One of the reasons it works is because when you win you don't do things that are so upsetting to the losers that they feel like they have less, they have more to gain by turning over the system.
That is the way successful countries, and Canada has been one of the most successful countries over the past quarter century, they operate. That when you win, you win within limits, when you lose, you accept the outcome.